Design wise? yeah man totally.. how many threads of 'my iPhone 5 bent in my jean pocket' threads do you need to see?
Apple made a special stainless steel alloy for the iPhone 4 - watch the iPhone 4 intro video. they replaced it with the softer, more readily available aluminium. To me, that's a downgrade.
I use an iPhone 5 - skipped the 5s. I never use a case on my phones. the edges are all screwed up (i have a black one). Also, I don't know if its just my eyes playing tricks on me, but i swear if i place it on a flat surface, it doesnt sit completely flat anymore.
my black iPhone 4s that i have, that i no longer use, sure there are scratches - the back glass even has a crack. but the stainless steel band? pretty much pristine.
I'm not saying it's a better phone, but yeah it is a more solid industrial design.