The camera retains good level detail , even ISO speed increases.Compared Sony Alpha A9 , better retention fine detail ISO speed increases , well better colour saturation.Whereas said n't impressed ISO6400 A9 , looks like A9 II delivers good results ISO6400 , images taken ISO12800 may still provide usable results.ISO figure noise starts become visible : ISO12800 ISO figure noise overwhelms image : ISO51200 Interested ? Help support ePHOTOzine using links.Amazon UK Amazon US Zeiss ZX-1 The ZEISS ZX-1 offers slick bit design produces quality images , albeit price may consider little high.It 's also camera wo n't everyone.In fact , I 'd describe 'Marmite camera ' , photographer either love hate.There remarkable cameras produce images previously unthought-of ISO values.How ZX-1 fare ? At ISO 80 100 , images totally clean standard .