Doug, it really depends what your priorities are. If you want to shoot moving targets, forget MF lenses for example. If you look at Canon 50L f:1.2, like Sigma 50 f:1.4, it is optimized for close up wide open performance, and it maximizes background blur. But using the Canon for landscape shots at infinity would not produce best-of-class results. The Zeiss 50 ZE Planar f:1.4 is the exact opposite. Superlative for landscape/cityscape (my use), but not so comfortable wide open close up. The Zeiss 50 ZE Makro Planar f:2.0 is, of course, much sharper up close than the f:1.4ZE. It is, as befits a Makro lens, übersharp close up, plus it offers the traditional attributes of Zeiss: vivid colours, great contrast, both micro and macro, 3D effect. Opinions on its performance at infinity are mixed. Some say it is better than f:1.4, some less so. It seems to be a matter of personal perference. If you are first and foremost for sharpness, 50MP is the way to go. If you are more into drawing style and rendition, the f:1.4 should be your friend. Hope this helps