Here is a quote from wjm308 in his write up on the 18x XTR3..
""Other $2k class scopes I have used would be the Leupold Mark 5HD 3.6-18x44 which had better turrets and similar DOF/Parallax; however, my copy did not do that great in overall IQ and the sweet spot of the NF NX8 and Burris XTR III was quite a bit better than the Leupold. I've had the Steiner T5Xi's and their CA was so bad they were immediately returned. The Bushnell LRTS 4.5-18x44 and Tract Toric 4-20x50 are lower priced and suffer from heavier CA; however, they do have impressive IQ for the price. It is my personal opinion that the Burris XTR III 3.3-18x50 is the best overall scope in its class ($1500 - $2000) and offers a great value for its price. I have used the Bushnell ET 2.5-21x50 DMR II and was quite impressed, but optically it would not stand against the XTR III, Bushnell also has their new DMR II Pro which may compare IQ wise but suffers in FOV and is 5 oz heavier and has no illumination offering."""
I believe Ilya is waiting for the illuminated model to do his review.
And more anecdotal in nature, I know two guys now who have sold MK5s for XTR3's, neither of which I ever thought would buy a Burris optic, but both say the like the Burris better.
It sounds like you got a good one in the glass department Will. I've compared my XTR3 to a handful of Razors and a few MK5s, and the Burris has been right there with them. Given glass variance and personal opinion it could go either way. But the XTR3 is right there amongst its competitors as a very solid optic choice in the $1700 to $1800 price point. The only point I'm trying to make is people who keep asking for opinions on sub 2k scopes that keep getting the standard Leupy/GenII response are missing out on a very strong 3rd option.