BETTER IMAGERY?
Robin...
If we are talking two photographers who have absolutely equal skills (I know that this is probably impossible but, please bear with me - this is a hypothetical situation) both of their images should be equally artistic, pleasing and be equal subjectively. Objectively, the images shot by the photographer with better equipment MIGHT be sharper and have better contrast etc. They might also be better because the better cameras/lenses can be more effectively used in the venues in which the photographer is shooting. In this case, we can consider indoor sports like basketball, hockey, etc.; or used more effectively in lower light levers, or may have focal lengths more in line with what the photographer is shooting; (i.e.: using a 100-400mm f/4.5-5.6L IS lens rather than the 18-55mm f/3.5-5.6 IS kit lens for wildlife). Additionally, the photographer using the better equipment JUST MIGHT be able to continue shooting under conditions which would knock out lesser cameras. I mentioned my Canon FX and FD cameras failing under the harsh conditions of Dong Ha, Vietnam.
I am sure that if all cameras are equal and if it is only the talent of the photographer behind the camera that differentiates the quality of the imagery, talented professional photographers, like Colin, would certainly not waste their money on the 1D series cameras but, would shoot with the cheapest Rebels available and save the extra money to purchase vintage wine! In fact, he might shoot with his cell phone and save even more money for some premium brandy to give to Donald...
Or to make an analogy between camera gear and cars, if I drove a Nissan Versa which is about one of the least expensive new cars availble in the USA (at about $10,000 USD) and you were driving a 700 horsepower Lamborghini Aventador (at about $380,000 USD); we would probably be just about equal in our capability to drive to the supermarket to pick up a carton of milk. In fact, the better driver would probably do better.
However, if we were in another venue, a racetrack, the Lamborghini Aventador would most likely win hands down, despite the skills of the drivers (as long as the guy with the Lamborghini Aventador didn't crash).