Mike, seems as though you are contradicting yourself there.You state that cameras shooting NPH all have the same sensor and thus no difference in quality. Then you say that the lens makes a big difference. you can't have it both ways.
Sorry for the late reply (I've been away) and for flogging a long-dead horse. We were, as I recall, discussing which factors were more, or less, important in determining overall image quality. I suggested that:
(1) Because different digital cameras of the same format (eg. APS-C) use different (and non-interchangable) sensors, choice of digital camera makes more difference than choice of film camera. All 35mm film cameras can be loaded with Velvia. Only Canon cameras have Canon sensors. Even when the same (say, Sony) sensor is used, different support electronics ("imaging engines") are often used. So the choice of a Canon vs Nikon digital SLR will make more difference to final image quality than choice of Canon vs Nikon film SLRs. I can load Delta 400 in both film cameras but cannot load a Canon sensor in my Nikon digital SLR. If I want and like the look of Canon sensors then I must buy a Canon digital SLR. If I like Porta 800 I can load it in whatever film camera I like. Choice of camera makes a difference for digital while choice of camera makes less difference for film. Because I can use the same film in different cameras but must use different electronics in different digital cameras. However, I doubt I've made myself clear . If you disagree then let's just say I'm wrong. Different sensors produce the same results, while the same film magically changes itself based on the camera its used in. Or whatever.
(2) I agreed with an earlier poster that often the lens used makes less difference than people think. However, I raised the caveat that most rangefinder lenses are pretty good but often cheap SLR zooms are not. Hence "buying a better lens" might gain you more, as improving from "not good to good" rather than "good to better" produces a more obvious difference.
You disagree with this as well. Fine. I see this as more problematic than my first statement. But I don't see how this contradicts my first statement at all. I certainly don't see how it is "having things both ways". Choice of camera and choice of lens both have some influence on the final image. As do choice of format, print size, post-processing and all the other factors being discussed. I think choice of camera matters more when that results in a different sensor, and I think choice of lens matters more when the quality of one lens is fairly low.
I don't really know what you think.
You appear to be saying that two 35mm film cameras loaded with the same film produce results which are quite unalike, while two digital cameras with very different sensors take photos with few differences. Me, I can't see much difference between Provia shot in an EOS 30V and Provia shot in a Nikon F601 (both with 50mm lenses, both I've used recently). I can see obvious differences between my 30D and my friend's D70 (mostly in amount of and "look" of noise at mid-to-high ISO sensitivity). You maintain they are less different than the aforementioned film shots. Or seem to, though I can't really think you do.
You seem to think the difference in quality between, say, a Canon LTM 50/f1.8 and an M-Hexanon 50/f2 is large (I think they produce a different signature but are of similar-enough quality) while a kit zoom and a Canon L prime are of equivalent quality (I think their kit zooms can be adequate-to-good when stopped down and used within their limits, but that almost any prime will do as well or better, and have wider limits). This is more a matter of personal taste and opinion, but I still wonder if you believe what you seem to be saying.
...Mike