Core 59 to KH 420 ?

[Jaxjax]

What has me stumped is going on 4 years with Core 59's which don't measure that well supposedly but astound me each & every sitting which is every other day or so. I can easily jump to KH 420 or equivalent Genelec but is there a guranteed jump in performance that actualy makes a differance ?. I can move my head all over the place with no percieved change in responce. I can also enjoy from 15' away off axis eating dinner. My overly reflective room must be in my favor once EQ'd
Is this a pay to play scenario ? can ASR show me by published data what I can expect from such a move.?
Thanks
Joe