Bro, the distortion is visible in the raw file. Buildings are tilted inwards. It is like a lesser fisheye lens. Only the center horizon when held horizontally straight is straight. I personally do not find it usable. Only the jpg is usable but the colours are like.....
Just got my SEL2470Z, despite the negative comments from many of you here. Did a quick comparison between the jpegs and raw and yes, the distortion issues are very apparent. But like what some have said, it's not something that is terribly difficult to correct in post. just a +10 distortion and some vignetting tweak in lightroom and there you have it. When the adobe lens profile is out, that would not be an issue anymore.
Sharpness-wise, seriously I'm not sure how subjective it can be. I've not used any Canon L, Leica or Otus lenses before, but from the 24mp files of my A7 with this lens, both center and corner sharpness is definitely acceptable, if not good. As an enthusiast who don't print large, the image quality is very good, even if I have a cheapo kenko uv filter on it.
Then the question on if the premium price is worth it, I'd say yes. The build quality, af speed, OSS, size and weight, there's literally nothing like it. More importantly, the lens feels so damn balanced on the camera. If you are just a hobbyist/amateur shooter, this lens fulfills all your needs. If you are a professional, the colours and contrast and detail this lens renders is more than enough for you to pp with, coupled with lens profile soon (I hope). Of course if you are a diehard architecture/test-chart fanatic, of course you are not going to be happy about it. You're looking at the wrong lens.