NEX + fixed (prime) lens for everyday use?

Hello everyone, this is my first post on DPR !

Is there anyone here that use on regular basis a fixed lens on her/his NEX? I was looking for a better alternative to RX100. I want a better IQ but i also want to keep the size of the camera as small as possible. I'm looking at NEX 5R as a body and because i don't need zoom i choose the thinest lens that i found, SEL-16F28. But this lens have some reviews that are not so nice with it. I'm thinking that this combination is like a little RX1, maybe the RX10 so waited by some people. So what do you think? It may be a good combination? Some other lenses will be better? What do i miss with this?