SEL 1018 vs SEL 16 and Sigma 19

Great job, better than most professionals, but now I am not so sure that I will buy the 10-18 because:

I will probably use it either at 10 or 18, prob rarely in the middle

The 16 look GOOD compared to the zoom

The 16 plus the 2 adapters are a lot less expensive

If I buy the 16, I get a 16, plus 10ish plus fisheye

Honestly, do you think at 11x14 or 16x20 size prints, I can tell the difference between the 16 and the zoom?