sorry this took so long, got sent out to the field for work all last week, but i got to Cabelas yesterday and compared the Cronus to the Viper HD's and Razors. First off let me say this was an in-store comparison, with that said the Cronus have way more clarity and E2E contrast then the vipers, the Cronus are hands down better through my eyes. Where it gets tricky is against the razors, Cabelas only had a pair of 12X50's to compare to my 10x42 Cronus. The razors had a crisper edge then the Cronus but i felt like clarity was right on par with the razors while checking out animals at different distances. Ideally i would have been able to compare them around sunset but i didn't have time, so while i think the razors may have a little bit of an edge in-store, for a product 1/3 the cost the Cronus comes pretty dang close to razor quality.