Hi Kimmo
as I did stress my preference for the Leica is a personal thing and I understand others having opposing views. I work in an optics shop and regularly view through the top four scopes (Leica, Nikon, Swarovski and Zeiss), I find that there is little to choose between them optically. This opinion is reflected in the fact that all four sell well, if one was significantly better optically everyone would buy it.
I do own the Leica APO77 (on my second one now), for me it's the best of the bunch. To my eyes it delivers the truest colours and the sharpest image, plus I love the twin focus wheel system.
I would agree that the Nikon is a great scope and delivers a very sharp image. But I do not get on too well with the zoom eyepeice, as this is what I use it is an important consideration.
I completely agree with you that it is vital to test these things for yourself, if possible testing the scopes side by side.