Is anybody else wincing their way through this thread as color neg is referred to as "color film" versus "slide film" which is almost certainly also color, unless we are actually talking about reversal processed B&W like dr5?
Argh. Maybe I'm just pedantic but it bugs me. They are both "color film" so it's "color neg" versus "color transparency" not "color film" versus "slides."
In any case I've never noticed any difference in sharpness. I can project my slides to several feet on a side, but I've only printed color negs up to 11x14. Both seem adequately sharp, nor did I see any sharpness difference in actual detail between Ciba/Type R prints from slides or RA4 prints from negs back when I did the former. Subjective impressions of sharpness are another thing of course and often influenced by the inherently much higher contrast of the pos/pos prints, but in terms of actual visible detail I can't say I noticed.