This is definitly fake, thepaint texture pattern is identical to the 35mm.
If you look at 50mm lenses though they are generally horrible for image quality. Take any 50mm lens from Nikon, Lecia, Zeiss, Sigma, and they perform as well as most primes perform at f/1.4 when they're set to f/2.5-f/2.8.
If this lens was f/2.0 or f/1.8 it wouldn't matter as long as it was as sharp at f/2.0 as current lenses are at f/2.8.
I would really love to see a 50mm IS with round aperture blades and a focus on extreme image quality across the focal range, it would be amazing.