Lets dig in, bypass any marketing SPV and bring on some brain pain
If you simply review the specifications of each brand's succession of camera models with ever greater imagers, they also utilize correspondingly ever greater capacity DSP and data transport:
Nikon Expeed DSP ASIC
Canon DIGIC DSP ASIC
Sony BIONZ DSP
Sony Exmor Sensors & DSP
Varients of the Fujitsu, now Socionext Milbeaut architecture processors appear in Leica M and Leica S2, Nikon, already referenced, some Pentax K mount cameras, and the Sigma True-II processor.
Check out - Socionext Milbeaut Image Processors
Here we go, the needed level of technology detail:
Fujitsu Milbeaut M-4 block diagram delivered since 2006.