Saw this on one of the forum and could not resist it and finally got it. Those day when I had the 50mm KM 1.7, it really blow my mind away. I was hysterically happy of the sharpness and the bokeh. The KM is such a solid body and such a beauty itself and robust! Yet it was departed when I bought the Sony f1.4.Two years back I got departed with the f1.4 due so moolah urgently needed. Such a sharp lens which I need to be departed that time.
Finally the chance came today to redeem myself... well, the SAM lens is quick to focus and not as noisy.. but still believe it could be further improve.. yet with that kind of budget. what more can you ask..There is certain characteristic about this lens that is different if compare to KM f1.7. Each each own uniqueness. However, you should be aware of the coating and am still trying to figure out the digital advantage of the KM. 1.8 vs 1.7.. there tend be be some observable difference if you focus at certain degree of depth. I could only recall and feel as much. I hope to shoot something at decent sunlight and see how it behave. At 1.8, C.A. is prominently noticeable.. well, still bearable..we can always dealt this on photoshop though a little bit tedious for the extra works. It should come in really handy in some situation to get some desire sharpness and decent bokeh at the same time for some shots.
My A580 does confirm of the back focus issues once at certain distance apart of wide focusing. Guess I could not keep a blind sight to it and will have to send it to Sony for calibration. Even my A100 work so much better.. haha..
