Why did you make the switch? If you dont mind me asking
I switched to the S4 from the ONE for numerous reasons...
wanted the larger S4 screen and latest Gorilla screen (since I don't use screen protector),
ONE fonts seemed narrow,
ONE felt rough w/sharper edges when holding,
even though I knew it when I purchased the one...mentally I realized I wanted a replaceable battery...what if I do keep it for 2 years and have trouble selling the One since the battery is 2 years old?,
decided the replaceable cover of the S4 could be an advantage at sell time,
lighter and shorter S4 is an advantage for me.
I think the primary reason is the 5" screen...some say it's not a major difference but for myself it is...
using the ONE basically meant using my reading glasses 100%, using the S4...I can get buy much of the time w/o reading glasses unless I'm cruising web pages, magazines, etc.
I am not dogging the ONE since it is pretty nice...but these were just the thought processes I went through when I decided to switch...glad I did however.
...
Oh yeah, my battery life on the S4 has gotten MUCH better but I was forced to use "Green Power" and turn off most of the Google Location stuff (maps, latitude, etc...). I've also disabled a few apps via application manager since I'm trying to avoid rooting to get a good feel for the S4 in it's stock state.