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Yeah I think there's a few (2 or 3?) in the top 10 WZ earners that are on mouse and keyboard but the others are controller users.I expect so, yes. Im sure I read somewhere that only 30% of the COD population are on PC. Then maybe 5-10% of these wont be using K&M
As to "is controller better or worse that K&M" I think there will be instances where K&M is better (e.g. up close) and instances where controller is better, due to aim assist.
What would be fantastic is if there were lobby options of zero aim assist on controller input, then pit K&M vs controller players
One of my friends uses a controller and has no aim assist features on, he still does quite well