The M.Qs are much more assertive than the Manhattans, and I gather ( from one of the 'old hands' on here ) that they sound somewhat fatter and less gritty than a standard P90. I once described the M.Qs as being "Certainly not shy in the showers... ".
I have not gigged them, but have of course had other B.K.P pickups to compare them to. They give an even thicker sound about 2mm from the underside of the strings, and yet retain clarity. At about 2.5 - 3mm from the underside of the ( fretted) strings is a very nice Larry Carlton ( Sapphire Blues band era ) '335' tone to my ears. much clearer in fact, with the ability to confidently push the amp if needed . As I mentioned in another thread, they sound even nicer in my 335 copy , than in a fully hollow, although, to be fair to the M.Qs, I want a really open / sweet sounds from my fully hollows ; hence them having Stormy Mondays and Manhattans in them. I put Mules in a Les Paul, as it would be rude not to ! :)
I would use the M.Qs in my 335 copy, if ever gigging again in a loud, seven piece Blues/Soul/ 50s R&B band / context.