I have searched quite a bit for some info regarding this and haven't found a direct comparison. I have a Parker 5 string with the stock Ultra Jazz 5s (I suspect the winding may be a bit different than off the shelf Ultra Jazz pups). Replacement options are limited to standard Jazz style pups, I don't plan on routing the Parker. I run it through a SWR Bass 750 with a MESA 4x10 and 1x15. Anyway, how would the Bartolini Jazz replacements compare in sound and output. I prefer very modern tones for rock and metal. I have Bart soapbars in an Ibanez 4 string and love the pups, but the bass itself just doesn't compare. Thanks all.