Hi, my own experience is that the 18-55 is softer than the 30 but can be sharpened up well in lightroom. The real surprise given some reviews was the 50-200, this lens is incredibly sharp even fully open. I have recently returned from a stock trip in France where I took only the nx10 and three lenses and the lack of weight in 30 degree city heat was a godsend, very pleased with the results although I think my ideal kit would be the 30, 50-200 and the forthcoming 20.