I didn't know the S4 is actually smaller than the SIII. That is quite a feat, shaving some bezel is something I've been proclaiming for years now!

Comparing the S4 to The One, they're nearly identical/same in size. However, the S4's superior (or equal) in every way except for:
- One has stereo loudspeakers on front (something I also proclaimed for years)
- One has a more premium look and feel to it (another thing I've been crying for years!)

But what do I think?
I think the Samsung should've done the S4 with The One's design, but with a 4.5 inch size. That way its a comfy size for the majority. Heaps heaps more advanced and better than The iPhone (4in is puny!). And it allows Samsung to differentiate enough with the NOTE series, perhaps they can even shave its bezels and make it something like 5.2 inches in screen size.