From what I could observe from shooting the match then ROing it, Serge with a Vectronix Vector IV had the best LRF of anyone shooting the match, but then again at a retail price of over $10K it should be good. Also I think a squad of the .mil guys had Vector 21s or 23s but I didn't have time to ask them. I saw a few Impact 4000 LRFs but did not get a chance to ask the guys using them how well they were working. Most everyone else had Vortex Furies, Sig Kilo 10Ks, and Vortex Vector-Xs. My opinion was that the Sig Kilo 10Ks worked slightly better than the others but they were by far the most common LRFs at the match so I can't say definitively. I will say that the glass in my Sig Kilo 10K Gen 2s is A LOT better than the Gen 1 Kilo 10Ks. The image quality is sharper and much less blue than the Gen 1s and because the blue is less, image contrast and target identification is much better.
On our shooting days, my squadmates had Sig Kilo 10K Gen 2s and with judicious ranging and guessing the best range from the numerous range readings we took, nobody in my squad had any misses to gross errors in elevation.