Out of interest I compared the 12-35 and PL25 1.4 lenses at 25mm FL on Sunday. For most part the differences weren't too dramatic, the 25 wins overall, just better edge sharpness basically otherwise take your pick. However one anomaly that I noticed when viewing at 100% was the difference in DOF even though all settings were identical (focal length, aperture, shutter speed, ISO and same focus point). Here's an example, these are 100% crops of the original shots, both shot at 25mm, f5.0, 1/2500 sec, ISO160. PL25 is first, 12-35 second. Notice how the 25 has much wider DOF for the same aperture. Not sure why this is, I took 3 shots of the same scene with each lens and it was the same every time. Any ideas, just food for thought really.