Every „technical” site is talking about sharpness, transmission, CA, etc. Maybe because it is difficult to quantify a subjective parameter as color rendition, maybe because some are relying on PP to improve their photos' colors, this factor - color rendition - is not as debated as others.
It first stroke me when I put a 100mm macro (nonL) on my 50D - wow, even after 17-55 IS and 70-200 f4 the pictures had that "pop", the colors were so bright and beautiful.
I also heard good things about 35mm L and 135mmL, so your opinion regarding top lens for color rendition would be very interesting to be heard.
My top is:
1.Canon 100mm macro (nonL)
2.Canon 70-200 f4 (non IS)
3.Canon 17-55 IS
4.Canon 18-55 IS II
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1000. Canon 50mm 1.8