Hi jja,
I also recently bought a 90 Elmarit-M. I agree it is a good lens but some of my early efforts were botched due to hand-holding at too long a shutter speed. The max aperture of 2.8 seems slow when compared with the 1.4 of the 50mm lens that came with the camera. See my gallery for some of my better efforts with the 90mm Elmarit-M (esp 'Zahra 2', 'Engaged', 'M9 prototype' and 'Little Hoodie').
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Monz