I agree. I also replaced my 42.5/1.7 with the Siggy. Though the 42.5 is certainly more compact, and it was a fine lens, the Siggy 56 just feels a step up, and of course the wider aperture helps.I bought this lens a while ago to replace my 42.5mm 1.7. I wanted a little longer prime for outdoor shooting and head shoulder portraits between the 75mm and the 42.5 (to make it a little more versatile yet perfectly suitable for head&head/shoulder work) and this one fits right in. I love the IQ I get out of this lens. It's razor sharp @1.4. Even when taking full body shots. I'm also very happy with the focus... It works more reliable compared to my copy of the 42.5 which missed occasionally especially from a longer distance.