Remember: what constitutes ‘ultimate’ is actually highly subjective; some value smooth drawing quality and tonal transitions over outright resolution; others require zero distortion or high color accuracy or secondary color correction. If anything, my personal preferences tend to lean towards resolution and microcontrast; I can accept some vignetting, distortion, secondary lateral CA (but not longitudinal) – because these are easy to fix in post. Field curvature, smearing, coma etc. are not. Not all lenses on this list are here because of technical perfection or MTF chart performance, either. On top of that, there are two lenses that are not system options, but included anyway because they deserve honourable mentions. There are probably also better lenses I’ve not used yet (and so obviously can’t include them). I’ve tried to give justifications where possible. With that in mind, and in no particular order, here we go.
**Items denoted with two stars are lenses I currently own. *One star, lenses I’ve owned. Links are to reviews or affiliate suppliers. Images shot with the respective lenses mentioned.