Have Sasuke Surpassed Orochimaru ?

It is proved that Sasuke have surpassed Orochimaru. If we look back over chuunin exams arc, Orochimaru was searching for a new vessel to overtake his body. He was greatly interested in Sasuke. He let Sasuke approach him in search of power to avenge his clan.
Orochimaru was a dangerous reputed sannin who knows more than 1000 of forbidden techniques which he had researched over many years. During the Sannin Showdown arc, Orochimaru was able to fight with Jiraiya and Tsunade, still the power level of the trio were equal.

Orochimaru along with Tsunade and Jiraiya fought with Hanzo in Amegakure. Despite the fact that Hanzo was the strongest among all, they were able to stand against him. In the Tenchi bridge arc Orochimaru was able to fight with Naruto in his Kyūbi cloak mode, which was powerful enough to create tides and pressure in atmosphere. If we talk about Ninjutsu, Orochimaru have mastered many of them. During fight with Hiruzen he knew techniques like Shuriken Shadow Clone Jutsu - it was also a top class Ninjutsu as stated by Minato. 

The Edo Tensei (Reanimation Jutsu) - he was able to manipulate every single movement of Hashirama and Tobirama whom he has reanimated. Orochimaru was also a threat to Akatsuki as stated by Péin. Orochimaru abandoned Akatsuki after extracting Intel from it, Sasori stated that the 3rd Kazekage was being able to control was a great deal since without destroying any vital organ Orochimaru was controlling him like a puppet. When Sasuke confronted Orochimaru for killing purpose, he extracted his inner beast - the real form of Orochimaru which was a giant snake. 

   

Now let's talk about Sasuke. He was a sharp kid from childhood, but not as like his brother. Sasuke was still smarter kid than others of his age. He learnt the great fireball jutsu at aged seven, and along with Shuriken jutsu. But it was not enough to beat Itachi. After the Uchiha clan downfall, Sasuke in the intention of killing Itachi trained hard. When Orochimaru confronted him, he was able to resist his paralysis Jutsu, also in combat fight he tricked Orochimaru and in the final he defeated him using the dragon flame jutsu. But it was just Orochimaru testing the perfect shinobi for being his vessel. Orochimaru granted him the curse seal and observed him during the whole chuunin exams. During the battle with Yoroi, Sasuke used his cursed seal power to defeat him, after his fight with Gaara he used his ultimate speed and moves copied by Rock Lee which greatly impressed Orochimaru. 

After Konoha's destruction, Orochimaru send the sound four to approach Sasuke to him. In that time Sasuke was weakened by the fight with Aoi. Sasuke in seek of power leaved Konoha, but still after the fight in the final valley Sasuke evolved his Sharingan into three tomoe from two. He defeated Naruto using his next leveled curse seal. 

After the Tenchi Bridge arc when Naruto confronted Sasuke, he had grown strong with new techniques and speed movements. Sasuke defeated him using his newly developed Chidori stream and was able to see the Kyuubi within Naruto.

During Guren's arc Orochimaru was training Sasuke with his Oto ninjas. Sasuke defeated every single of them without killing anyone which again shows that Sasuke was now at Orochimaru's level.

When Sasuke was finally able to defeat Itachi, he killed Orochimaru's body and absorbed him in genjutsu by his Sharingan. Sasuke led out in search of Akatsuki in order to meet up with Itachi. Even with his team members Sasuke was enough powerful, in sensory types, in using curse seals, etc.

Sasuke when comes face to face with Itachi, he defeated him in his own genjutsu by breaking Itachi's genjustsu. Sasuke was able to use his hidden snake technique just like his master and also the body replacement technique which Orochimaru use to perform. Sasuke learned new fire style techniques like Great dragon fire jutsu. The lighting technique Kirin which he used in his final attack on Itachi was also the technique Sasuke learnt in Orochimaru's supervision.

After Itachi's death Sasuke awakens his Mangekyou Sharingan, but it still weakened him in his frequent uses against Raikage, Mizukage, Tsuchikage and Gaara. 
Sasuke's Susanoo was not much powerful after overuse of Mangekyou. 

                   

After when Sasuke implanted Itachi's eyes for his Eternal Mangekyou Sharingan, Sasuke was freely able to use Amaterasu, Kagetsuchi and all Inferno techniques. In the war arc we also saw that Sasuke bring back Orochimaru to let him know his answers. 

                   
                   
When Naruto-Sasuke-Sakura summons Gamabunta, Aoda and Katsuyu, Hiruzen recalls his picturization of the Three Way Deadlock from the past, it greatly impressed Orochimaru. According to Tobirama and Orochimaru - Sasuke have already surpassed Madara. But still Madara was strong enough to beat the five kages and bring up war to greater extent. When Hagoromo shared his half of Chakra with Sasuke and Naruto, Sasuke acquired the Rinnegan and teleportation techniques. Orochimaru entrusted Sasuke that he'd bring change and helping him as friend would simply being in his way. 
                 
                       

        So looking up these much about Sasuke and Orochimaru we can simply say the Sasuke have surpassed Orochimaru as a Sannin, but still Orochimaru is mastered in many Kinjutsu and had a great knowledge about experimentations.
Sasuke still believes in Orochimaru, that he have every answer to his mysteries. Even after war Sasuke approached Orochimaru in the Chinoike clan mystery in Sasuke Shinden novel. In Boruto series too Sasuke approached Orochimaru in search of Shin, which was related to the experimentations of Orochimaru. And in future too we could see Orochimaru and Sasuke shouldered to each other.