Question for you.... what, if any is the benefit of x7 magnification against the usual x8? Or is it just the design of the 7x42 Habicht that works so well?
I'd say the design of the Habicht is the most important factor. Size, weight, optical performance, size of the exit pupil and shape. The shape is really pretty important for me. I find I can hold slightly longer binoculars more easily steady than shorter binocular
as long as the weight is low enough. In addition I've got athritis in my right thumb, and the shape of the Habicht works better for me than most other shapes. (For instance, the Nikon 8x32 HGL is a nice binocular but the shape does not work for me.)
The distribution of weight also plays an important role for me, for instance the Zeiss 7x42 (which I had for a few years way back in the 1980s) didn't work for me all that well. Too narrow, too heavy at the front. That's one of the great features of the Zeiss SF IMO, shifting the weight towards the eyepieces seems to me to be an excellent idea. However, the 42mm models are too heavy for my liking. Nowadays I aim at a weight of no more than 750gr with strap and rainguard. I'm not getting any younger, and I tend to keep my binoculars for many years.
That said, I'd love to see more 7x binoculars on the market again, knowing full well this won't happen. I've still got steady hands and can hold 10x to 12x binoculars quite well - but the differences even between 7x and 8x is quite obvious in the field IMO. The view through a 7x binocular is steadier than through binoculars with higher magnifications, more relaxing, especially when I'm using the binoculars over long periods of time. And the depth of field (that depends solely on the magnification) is also larger with 7x binoculars, and that is a nice feature.
One last thought: I think a stabilized binocular would be ideal for my style of birding. But the size and shape would need to fit my needs, and the exit pupil would need to be large enough, and I need a diopter correction range of +/- 4, ideally 4.5 diopters, on days when I can't use my contact lens. In other words: All the Canon models are out, unfortunately.
Hermann