There are plenty of comparisons between DSLR cameras and mirrorless/EVIL/system cameras, and the overall picture is that the two systems target different users and different uses. But I'd like to focus on another aspect that I couldn't still figure out.
The main difference of course is the presence/absence of the mirror, which allows for smaller size but - I guess - also a smaller minimum distance between sensor and lens. Can it have any significant advantage in term of wider angle, different optical designs, adn ultimately better potential quality? Can it allow larger sensors (compared to FF) with less complications?
For this sake I'd like to avoid comparing sensor sizes (there's already plenty of that), also given that APS-C and FF mirrorless are being made. So let's compare APS-C vs APS-c and full frame with full frame.