I know you like the 56mm objective, and I used to think that objective size trumped all, when comparing 2 high quality optics with exit pupils under 6mm at a magnification in low light, until I compared my MK6 to my Kahles K16i 1-6 optics.
I could not honestly tell you one resolved meaningfully better at 6x in low light, even though the Leupold has an exit pupil of 3.3mm, and the K16i, of 4mm, a difference of roughly 20%. It may have on paper, but in my real world experience holding one in each hand at dusk, greens became browns at almost exactly the same point, and looking into dark shadowy areas with either was very similar, except the K16i had a noticeably larger FOV to my eye, and the fact that I picked up on that more than the light gathering is huge to me, considering the FOV difference at 100 yards on both is only 0.5% or so (20.1ft for the K16i, 19.3ft for the MK6), and I was looking at things FIFTY yards away.
Anyway, my point is, sometimes the paper math, in the real world, takes a back seat. The MK6 and K16i have near identical footprint, but someone may well choose the K16i over the MK6 for the "light gathering" even though they wanted the turrets and reticle of the MK6...and then they would compare the two in person and forever hate their decision.
So before you buy...look.