I own the 14mm f2.8, bought used for a ridiculously low price. Absolutely love the 14mm for the sharpness and low distortion. Recently I picked up a used 16mm f2.8 for CDN$300 and LOVE IT. Super sharp, very fast focusing, weather sealed, and small. I won't sell my 14mm but if you can find the 16mm f2.8 used for less, I'd grab it. If you are sticking to buying new I'd still go for the 16mm f2.8 because it is $500 more for the 14mm. YMMV