How good is the original 5D Mark I compared to the 2013 Canon's?

OK, cool. Thanks for that. Loved the cute video.

And from your given definition and accompanying cute video it appears that I confused the definition of acceleration with that of velocity. So yep, I did need remedial classes in physics.

Of course this now probably means that my camera doesn't have an ISO "SPEED" unless of course the camera is travelling with me; and the Canon 5D is as fast as any other camera. {giggles}