This is how the benchrest boys at 6MMBR rate Leupold
Leupold Competition Series 35x, 40x, 45x
Pros: The best resolution, brightness, contrast, and largest exit pupil of any high-magnification fixed-power scope you can buy. Better lens geometry and clarity than any zoom. Turret covers and screw-in lens caps standard. Very good warranty service, not limited to original owner. 30mm tube offers more elevation adjustment than older 1" Leupold Target Scopes or B&L 36x.
Cons: Unstable wire reticle may require after-market modification. Leupold is shipping too many with off-axis cross-hairs--look before you buy. Lash issue with side focus.
OVERALL: BEST FIXED-POWER SCOPE under $1200. Even with its flaws, still the best fixed-power competition scope you can buy, short of the $2150 March. Leupold needs to do some technical re-design and ensure the scopes ship with plumb cross-hairs.
Leupold LRT 6.5-20x Zoom
Pros: Excellent resolution, clarity, color rendition and contrast. 72-moa elevation range is best among all scopes tested. Smooth-functioning controls with distinct, positive clicks. Exceptionally good lifetime warranty service, not limited to original owner. Silver finish available. Good value, especially if you shop around for discounted prices.
Cons: Max power is actually 19.2x and you get some edge distortion at full zoom. Lash issue with side focus. Leupold is shipping too many with off-axis cross-hairs--look before you buy. When set to minimal parallax, target can be slightly out of focus.
OVERALL: This scope gives a great image of the target--sharp with good contrast, good color balance, with very little edge distortion up to about 18.5x.
Leupold LRT 8.5-25x Zoom
Pros: Excellent resolution, clarity, color rendition and contrast. 72-moa elevation range is best among all scopes tested. Smooth-functioning controls with distinct, positive clicks. Exceptionally good lifetime warranty service, not limited to original owner. Silver finish available.
Cons: Max power is actually 24.3x and you get some edge distortion at full zoom. Lash issue with side focus. When set to minimal parallax, target can be slightly out of focus. A few reports of unstable tracking on early 8-25x LRTs, but that seems to have been corrected in current models.
OVERALL: BEST BUY in a high-power zoom. This scope gives a great image of the target--sharp with good contrast, good color balance, with very little edge distortion up to about 23.5x. This is a great choice for long-range target shooting. The extra power (vs. the 6-20x LRT) does makes a difference and is worth the added cost we think.
Leupold/Premier 20-50x Zoom (boosted)
Pros: Excellent resolution, color rendition and contrast. Offers high power with acceptable brightness, while retaining more elevation moa than the large NF scopes. Premier offers wide choice of reticles at no extra charge and Premier fixes off-axis factory reticles when boosting. Silver finish available.
Cons: Not as bright as Nightforce (with 56mm objective) at like power settings. Very small exit pupil at high power. Some chromatic distortion at edges, when set at high magnification. Leupold warranty may be voided by boosting.
OVERALL: BEST BUY in an ultra-power zoom. Sharp, reasonable weight, excellent image quality.