So.... my first impressions... (not that my opinions matter as a newbie with only a few posts)
Certainly not the perfect Superman, but definitely not the catastrophe that the initial pics and reviews made him look. The suit is pretty nice, the colours are great, and the paintwork on the face and boots is pretty good. The sculpt paint isn't Hot Toys quality, as expected, but on mine, the tan is natural, and thankfully, the eyes are not all screwed up like the Drake figure. I do wish they were a brighter blue, but I'm sure some of you can make that change.
The body itself is tough to tell right now. At first, it was REALLY tight everywhere. But it did loosen up without much plying, so I'm thinking it might have been due to the cold weather (it's only 10 degrees F here, and I think it had an affect on the box being outside for while). I would say the body is similar to Batman. Not Hot Toys quality, but a big improvement on the Gi Joe line for example.
The cape. I would say that Sideshow is making the best 1/6 capes out of all the manufacturers (not including customizers like Tony). Mine didn't have the issue that Optibotimus had, in that my cape clips are even on the outfit, so the cape hangs well. BUT DOES REQUIRE A LOT OF PATIENCE AND FIDDLING. Both the wire, and non-wired capes. The tips will slide out of the outfit anytime you grab it. But when in place, both look pretty nice and drape pretty well. The biggest issue I have with mine is the stand. Because of the thickness of the stem, it's tough to put him in a decent hover/flight pose, because the stem/post of the stand gets in the way of his legs. Speaking of his legs, they don't look too thin.... until you bend them. If you have him in any kind of crouching or bent-legged pose, something looks off (probably because as they aren't real muscle, they don't contract with the bend, so they look odd).