Guys, I am pretty alarmed! I have done some testing in-house (with the built in flash) and I found out that my A 50mm is clearly sharper than the FA 31mm (1/100 sec, f6.3). Is this possible? please if someone has both lenses, do a comparative test. Either I have an ultrasharp A 50 or I need to pay a visit to the pentax guys where I have bought the FA 31. Thanks for replies!