Leica LTM Just how (un)important are cleaning marks?

Leica M39 screw mount bodies/lenses
I have a Summar and Summitar that both have their fair share of cleaning marks and probably a little haze; with C41 black/white film they perform wonderfully, but I tried (once) C41 color film and the contrast was extremely low. Reminds me I need to sell them, though I fear trying to ebay these things...
 
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