Ohhh, my favorite lens at the mo is my pentax DA*55mm f1.4, perfect in every way!
If i had enough money at the moment, i'd buy a pentax FA 31mm f1.8.
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Ameteurs worry about the sharpness, Enthusiasts worry about the lighting, and Professionals worry about their next coffee break! 
Pentax all the way! Oh and olympus too! And canon now you come to mention it...... And nikon, sony, panasonic, minolta, samsung, leica, fujifilm and all the others....
