Zeiss ZM Biogon 2.8/21 or C 4.5/21

Please tell us what would be better for you?
For me, it was the 2.8 because I needed speed, but that may not be the criteria you want.

Search for sample photos, drop in a shop to play with the lens and you may find your answer.
 
Check out this this thread , with the same question. I recall the consensus if, as you'd expect, that if you need more speed the f/2.8 is a fine lens, but the f/4.5 is a bit of a jewel, compact, with minimal distortion.
 
At this point in lens design, you should get very sharp images with good contrast from premium lens makers. So, in your case, the question becomes: Do you need speed or a compact lens?

The f/2.8 will be faster but larger and heavier.

The f/4.5 will be smaller and lighter but slower.
 
I wanted a smaller lens. The f/4.5 is small and it is sharp at f/4.5. I won't be using it in questionable light. So, if you want small and don't need the extra speed, go f/4.5. If you need the speed and don't mind the size, f/2.8. From what I could see from my research, prior to purchase, both are good lenses. I purchased the lens as an Ikon kit, so now I have a second body, finder, lens shade and the whole works at a reasonable price.
 
If you're shooting in bright light all the time, or on a tripod, then the slower VC lens is fine. If you need the faster aperture of the Zeiss, then, by default, it's the lens for you. Both lenses are VERY sharp. Neither is better, but the VC is just a superb lens, regardless of money. However, the first Zeiss lens i shot was the 21/2.8 in a store in Paris on a ZI with no viewfinder, rangefinder or auxiliary finder.. I just shot. I brought the film back home, developed it.... I went back the next day to buy the lens. I had to sell it a bit later due to money issues, but the lens was that good. It has that famous Zeiss rendition.
 
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