Fascinating indeed. As a comparison, it would be interesting to do the same for various other processors such as, 8008, 8048, 8080, 8085, 8051, Z80, V20, 8088/8

Fascinating indeed. As a comparison, it would be interesting to do the same for various other processors such as, 8008, 8048, 8080, 8085, 8051, Z80, V20, 8088/86, 8086/87 combo, etc. First we'd test these procs with a move/best fit translation of the 4004 code to 8-bit then redo the process with their additional/native instructions at 8-bit, etc. Wishful thinking I know, but I've always wanted to know how these early procs compared against each other in raw calculating power.