I think it's mostly down to what lens suits you. A great suit isn't the one that looks best in the shop, it's the one that (excuse the pun) suits you. For example- A friend of mine can really look good in a black suit with a red shirt. I look like a fool in a black suit with a red shirt. It's a great suit FOR HIM. Now, I could admire the technical finery of it, the precise tailoring or the quality of the textile, but it wouldn't look any better on me for it.
Lenses are the same way. I have a friend who can shoot beautifully with wide angle and fisheye glass. She's not much good with my prized 135mm, and to me a 21mm would be a glorified paperweight. It's not a question of the technical qualities of the lens, they're about equal in most technical aspects (I'm not going to name brands here, they're both older manual lenses, and I'll leave it at that), but they're only good to the right user. A lens that suits one's style and choice of format (Digital, MF, 35mm, ad naseum) is a great lens TO THEM. I wouldn't trade my 135mm for all the equipment the photo gods could tempt me with, but others would tire of it and trade it within the week.
If your lens is helping you make great work, it's a great lens. That's a very intangible and hard to quantify answer, I admit, but it means that a lens that needs a bit of PP correction for colour or chroma isn't necessarily a bad lens, and the sharpest, most beautifully rendering 1200$ Zeiss isn't automatically a great lens. Certainly I can admire and respect the technical aspects, I'd love to be able to put a brand new 85mm in my arsenal, but it's possible to think that a lens is very fine technically without believing it would suit me or my work. And if it doesn't fit my style, it's not great, TO ME.
I know that this is the sort of equal-but-opposite to the guys who photograph newspapers and brick walls all day every day to test lenses, and that the final result is more important than the lens idea is repeated as endlessly and is as cliche as sharpness and colour tests, BUT I do believe there is a middle ground. I'm trying to find it. Please don't take offense as I blindly stumble towards it.
Originally posted by Laurentiu Cristofor There is no such lens. You can always get better results with PP. It's not the lens that is the problem here, but the DR limitations of the sensor.
Depends. I doubt that a hasselblad or a 645D has very much limitation, but the influence of properties of film type (or digital sensors) on the final image is very important and often overlooked, especially in regards to colour images. I challenge you- Define "Better Results".