Originally Posted by LibertyOptics
Setting that scope at 90x I would receommend you do so and look through it before buying.
Not the zoom, but the fixed 90x eyepiece for the Pentax PF 100.
Here's a review of the Pentax PF 100 with a zoom and the review says that it compares favorably with Leica's and Swarofski's. Pentax PF 100 Review.
Since fixed powers usually resolve better than zooms, that's what I based my recommendation on.
Swaro/Leica/Kowa don't have a 90x option that I'm aware of. They all seems to max out at 60x. That's why I'd use the Pentax for long range and the Leupold for backpacking. I have only seen the Pentax PF100 in person once at the range and didn't have anything to directly compare it to at the time. However, I was easily able to see bullet holes on a black target after the sun went down at 300 yards.
The Leupold is for backcountry not long range spotting. The Leupold is more comfortable especially 4-6 hours/day glassing. 12x is good enough to spot deer/sheep/goats at 2+ miles with a steady tripod.
If the power is too high, it makes it tough to cover a lot of area. I don't own the Leupold but I used one several days this hunting season and I preferred it to my Nikon just because of the comfort. The terrain was steep and rugged. When I found a group of deer a long ways off, I'd switch over to the Nikon to count points. The Nikon did better zoomed in. The Leupold that I was using wasn't the HD version. The HD is supposed to have better resolution. Two days ago, I was at Gallenson's in Salt Lake and directly compared the Leupold HD to the Swaro. While the Swaro was a bit brighter with better contrast, the Leupold seemed to resolve objects just as well at the top end of the zoom range. It seemed better than the regular model I used during the season. And again, comfort wise, nothing I've tried comes close to the Leupold.