I forgot to point out that I use my March-X 5-50X56 on my match F-TR rifle with which I usually compete at 1000 yards. The scope prior to the March-X was a Nightforce NXS 12-42X56. I'm in my mid-60s and my eyes are not as good as they once were and I needed a brighter scope than the NXS for the early morning matches and when it was heavily overcast. The March-X presents a much better picture to my eye than the NX; brighter with better contrast. It was not a night and day difference by any means, but it is visibly better in the March-X.
There is nothing wrong with the NXS and it served me well. I kept the scope and recently, I had March change out the reticle in my March-X from the MTR-2 to the thicker MTR-5 because I was unable to discern the reticle and the aiming dot at times, especially on a black target. During the trip to and from March for the reticle exchange, I used my NXS to shoot one LR match. It did just fine, but I could well see the difference in the image compared to what I was used to with my March; I was glad to put my March back on the rifle.
The March 10-60 HM has arguably the best glass available on a riflescope and it is probable that if I did not already have the March-X 5-50X56 and I was going to upgrade from the NXS, I would get the 10-60X56. Yeah, even with a price difference. I'm a glass snob. There, I said it. I believe that you should have the best glass possible for F-Class as one tends to spend a lot of time looking through the scope. I believe that ED glass tends to minimize mirage and every little bit helps. On the other hand, I want to see all the mirage I can see in my spotting scope.
There's more to a riflescope than just glass, but that is a big factor, provided everything else works properly.
I find that the knobs are great on the NF as well as the March, but the side focus on the March is better. I added a big focus wheel on my March, which makes it even better than before. It actually allows me to change focus on the line to look at mirage at different distances at the very last second before shooting; just a quick flick with my pinky; something you just can't do with other scopes.
Finally, I know nothing of Sightron and never even looked through one; I have a March, why would I bother to look at Sightron.