The Canon Mark II 'big white' primes are said to be designed for 100MP. The smaller Mark II / III zooms are indeed in the 40 - 50 range. Bear in mind that the

The Canon Mark II 'big white' primes are said to be designed for 100MP. The smaller Mark II / III zooms are indeed in the 40 - 50 range. Bear in mind that the 24MP crop sensors have been pushing past the 50MP-full-frame-equivalent for several years and really show up any lens flaw. The one example that stands out is the Canon 70-200 f4 IS zoom, which has an ageing early-digital-era reputation for being razor-sharp but never managed that even on my old 1Ds III and looks like mush on a 5Ds. Hence a Mark II is to be released this year. Interestingly the even older non-IS f4 version was on the list of lenses approved for the 5Ds, which shows how difficult adding those extra optics makes lens design: https://www.the-digital-picture.com/News/News-Post.aspx?News=15356 https://www.the-digital-picture.com/News/News-Post.aspx?News...