Really its 2 stops better no? Cos now the base iso is 100 before it was 200... same as always with Nikon... They say their 3200 is as Canon 1600 when the already started 200 ... jumbo mumbo .... The D4 seems like a MKIV with full frame and the 1Dx seems like a compromise between 1ds3 and 1mkiv... nothing worth upgrading for many....