I brought my 10x42 SFs for actual tripod-based glassing, and a pair of Zulu6 16s for my walk-arounds. I would have readily given up magnification on the sigs if it would have yielded better FOV, because I was never really glassing all that far, and for me the 16s were plenty. I rarely used the SFs until it was close to dark.
Honestly, the sheep weren't hard to spot because they are a different color than the habitat...more reddish, when everything else was some shade of Mule Deer grey-brown to green. You can see it from pictures, though it seems more subtle through a photo. It's much more noticeable in person and at distance.
2 of the 3 times I spotted sheep, they were 350-400 yards and with my naked eye. The group I saw was closer to 1000 when I first saw them through binos, and I could readily see them without. Each time I knew exactly what I was looking at because of the shade of their hide.
I could see needing real magnification if you were being picky between a couple big rams, but for me and those I spoke with, this was typically not that kind of hunt.