I have both systems (pro2+x-t10 and Oly E-M1) and in my opinion olympus has only one real advantage - the 5 axis IBIS, it is just crazy how good it is.
I was a canon guy before fuji, and I really enjoy picture quality of my x-pro1 even after several years of using canon 6d and this is despite of ff dslr size and weight. X-pro1 is truly an amazing up to date camera in 2016.
x-pro1 + cz 32mm 1.8