From he Zeiss USA website:
"The Ultra-High-Definition (UHD) concept features a special coating and an improved optical design that ensures the binoculars deliver the highest level of detail and reproduce colors with natural fidelity."
Previously I'd ignored the SFs due to the botched initial release of the 42s, the subsequent faint praise of later 42s and 32s, and any remaining thunder being stolen by the quickly following NL Pures. I recently acquired my first SFs - a pair of used 8x32s at a nice price. I love everything about them, except for the noticeably poor contrast (or apparent contrast) that appears to be due to the widely discussed "green tint" issue. When attempting to pick out LBJs in thickets and brush they literally "pop out" when using NLs or SFLs in comparison to the SFs The SFs literally make dull birds duller and it's very disappointing. 20-25 years ago they might of been the best bins ever, but not today.