While the medium-format 51.4MP Pentax 645Z, capturing 4425 lines per picture height, remains the resolution champ of the cameras we've tested, the Canon EOS 5Ds takes the title for 35mm sensors, nabbing 4180 at its lowest sensitivity of ISO 50. For reference, Nikon's D810 turned in 3525 lines at ISO 32, while Sony's A7R captured 3325 at ISO 50. At ISO 6400 the 5Ds still beat the A7R's best with 3400 lines. Interestingly, at the 5Ds's top sensitivity of ISO 12,800, it captured 3125 lines, just behind the Nikon's 3175 lines. Plus, while both these DSLRs showed Unacceptable noise at this ISO, the D810 scored a slightly better 3.1 versus the Canon's 3.9.