Re: Longrange hunting spotting scope help!
If you hike a lot and have to carry your spotter for the majority of the time then you won't probably want to go with an 80/85 of any brand, even the lightest of 80s tend to be a little too much when you can get most of the function out of a 60/65.
On the other hand if you want to positively ID an animal then in most cases you should probably go with an 80/85 mm. The more light hitting your eye the better, especially when increasing power because your exit pupil will get smaller.
I've compared a Swaro 65mm HD vs. an 80 standard Swarovski during mid-day and it was still easier to pick out the details with the 80mm - that was probably about 1500 yards and it was just picking out branches on a treee, but kind of the same idea.
I do think though that most high-end (Swaro, Zeiss, Leica) 60/65mm spotters at 900 yards should be able to get you those details, and sometimes things like that can just be hard to see. Keep in mind everybody's eyes are different and what works for some guys might not work for others, but I think that you're going to have an edge with and 80mm over 60mm in almost any given situation as far as the view anyhow.