Reasons to choose EOS-1D X Mark II
Released in 2016, EOS-1D X Mark II has about 864 mm² of sensor area, 20.2 MP effective resolution, and a 1,530 g body. Use these values to narrow the field, not as an overall image-quality score.


The EOS-1D X Mark II has the larger sensor area. More area usually means greater light-gathering potential, though real image quality still depends on sensor architecture and generation.
These cameras were released 2 years apart. Consider sensor generation when comparing pixel metrics.
Amber marks the value that is generally preferable in this comparison context. It is not an overall camera score.
The EOS-1D X Mark II has the larger sensor area. The D810 has the lighter body. The D810 has the higher effective resolution. The EOS-1D X Mark II is the newer release. Also consider the lens system and subjects you shoot.
Released in 2016, EOS-1D X Mark II has about 864 mm² of sensor area, 20.2 MP effective resolution, and a 1,530 g body. Use these values to narrow the field, not as an overall image-quality score.
Released in 2014, D810 has about 862 mm² of sensor area, 36.3 MP effective resolution, and a 980 g body. Use these values to narrow the field, not as an overall image-quality score.