Well I can say from personal experience so far (my video review of the 735 is due some time next week on my youtube channel: Gesh75). The biggest differences I noticed in daily use are: General performance the new configuration (snapdragon 400 4 cores +1GB ram) is slightly faster in the main interface and menu's, but allot faster in apps like whatsapp for example (no resume screen) and quick at launching heavy games. Also Multi-tasking and browser performance is faster. Camera btw is also allot faster with the shot-to-shot times, and will no doubt be even faster with the upcoming updates.
So in short yes it would be a very wise upgrade for you. Also the screen is amazing ,clear black OLED just like on your 822, but with 720p HD resolution.
Also picture results are allot better it has the big aperture lens of the 720 which was already great, with the quality comparable and even overtaking the likes of the S4 and ip5 in the dark. And the front camera doesn't need an introduction I figure. So again I'd call it a no brainer!