Yesterday I compared my Nightforce ATACR to my S&B 5-25x56 PMII, including the FOV, "clarity", brightness, resolution, and "color". "Clarity" means the overall quality of an image, resolution means the ability to see fine details, and color refers to how accurate colors appear to be. This is not a camera lens review and don't pin me down to hard definitions. I'll also comment about the turret controls and reticles.
* Field of View: Switching between the ATACR and S&B, the NF image seems larger because of its slightly greater FOV. At first I thought it had more magnification, but I measured the subtensions of objects and the slightly greater FOV of the Nightforce leaves you with the impression of greater magnification, which is a plus.
* "Clarity": Qualitatively the S&B image seems crisper when you look at the entire image. Clarity is a combination of resolution, contrast, color and other technical factors. I can't quantify the difference, it's just an impression that you'll have when switching back and forth between the NF and the S&B, especially in the first few seconds of viewing.
* Brightness: The S&B has the noticeably brighter image, suggesting better light transmission. I said the difference is noticeable, but it's not huge.
* "Color": Intense colors seemed to "pop" more through the S&B, although it might have been due to the better light transmission. There is better contrast as well that is evident in shaded areas.
* Resolution: The S&B has slightly better resolution. Looking at the details of a house 420 yards away I couldn't really see any difference because there was a slight mirage. However, when I looked at the small blossoms of a tree (and other small detailed objects) about 80 yards away, I could see the details of the tiny blossoms more easily through the S&B. To take advantage of the better resolution you will need good seeing conditions.
* Turrets: I much preferred the NF ATACR turret to the S&B MTC in this case. The NF has 80 clicks/turn and the MTC has 120 clicks/turn, so the ATACR turrent has wider click separation and the feel of the clicks is positive yet not overly hard. The S&B double-turn (DT) turret avoids the problemmatic milestone clicks, but there are now 140 clicks/turn.
* Reticles: The ATACR MOAR reticle is really excellent, easy to read and non-obtrusive; I've very happy with this choice that also allows me to have a 1/4-MOA turret with only 80 clicks/turn. The P4F is a very popular reticle for this S&B model.
* Tunneling: Both the NF and S&B have very noticeable and surprisingly similar reductions in their FOVs at about 7X.
* Eyebox: At low magnifications, both scopes have an adquate eyebox due to the large exit pupil. At 25X I found the NF was slightly less forgiving of my head position.
Overall: Even though the S&B comes out slightly ahead in some specific categories, the NF ATACR is not very far behind optically overall. I categorized and described aspects of the image quality because people want to know about them. An often asked question is whether a particular scope can see XX-cal bullet holes at YYY yards. In this case I'd say the S&B has the better chance of seeing bullet holes at long range, but there is unlikely to be any difference if there is moderate mirage. Because of its brighter image and better contrast, the S&B would also be the better choice in low light conditions, for however long those conditions last.
I hope to have the ATACR at the range next week.