My opinion:
Reeves looks alot better as Superman. He has this quiet, dignified calm about him (more like Superman). The new kid looks a little pompous and cocky in some of the pictures I've seen. Like he's just a pretty boy and thats it. He doesn't carry across the same feeling that he should as Superman.
Reeves was also in better shape. Looking at these pictures, theres no way to deny that.
To the new guy's credit however, his facial features look pretty good. They're strong and pronounced, just like Reeves's. I particularly see it as important that the chin looks strong and that he has a strong chin. That is one of Superman's more distinguishing facial features.
So they got that right.
Broad shoulders, again, they're important but they don't solve the other physical requirements. They don't do it with the new kid, whereas Reeves filled out quite nicely.
Chest and abdomen look good on both, but again, Reeves looks better. The new kid looks lanky, which is a problem I mentioned earlier, and is not a good thing as Superman is not lanky and cannot be seen as such because thats a detractor from his strength and presense. The new Superman looks more like a Superboy or teen, not a "man" for these reasons. I can't take him as seriously because he's not as physically imposing.
They both have good, strong looking legs.
Now imagine the new suit on Reeves. Does it look that bad now? No.
Why? Not because its Reeves, but because he physically makes the suit more appealing to look at, because he fills it out better. So I think the suit is actually less of an issue than people think.
Whats that saying? "Its the man that makes the suit, not the suit that makes the man" or something like that?