Sanji didn't freeze, he was restrained by Doflamingo, the same guy who could restrain the person with the single greatest physical strength in the entire manga and turn him into a foot-stool. Zoro would have gotten the exact same treatment.
Sanji was also severely injured on Punk Hazard to the point that a blow from Nami caused him an immense amount of pain. Sanji didn't fight Vergo at 100%.
Hell Memories, which produced flames on the same scale as Zoro's super cut.
Zoro's opponents post-skip have been:
1. Pacifista. Sanji snapped its neck with one blow
2. Fishman fodder who couldn't even scratch the weakest of the Strawhats.
3. Monet, who was a weakling that any member of the Monster Trio can beat
4. Pica, who despite being a weak fighter made Zoro struggle due to the tactical usage of his Devil Fruit.
5. Fujitora, who winded him with one attack and left him looking embarrassed.
6. Carrot, who outmaneuvered him and left him confused on what exactly she was doing.
Hody Jones was defeated by a couple Gear 2 attacks and a single Gear 3 attack AFTER overdosing on steroids. Both of these Gears were portrayed as Luffy's B-material in the timeskip when he used it to knock out Bellamy(a fighter even weaker than Dellinger), an admittedly weak fighter like Monet blocked a Jet Gatling 100%, to destroy a Pacifista, when Gladius took a Jet Stamp with little to no damage, and the countless times both Gears failed to even register for both Cracker and Doflamingo. Zoro beating him BEFORE his overdose on steroids isn't impressive.