I had Paradigm Monitor 9 v.5's and I flipped some KEF IQ1's not too long ago... The Paradigms and KEFs have very different character. I would say the Paradigms are closer to the Polks in terms of sound. The tweeters will be more forward and "sharper" sounding. The tweeter on the KEFs was more reserved/laid back/"softer", with a more pronounced mid-range. Of the two with no EQ, I preferred the Paradigms.
I eventually sold the monitors and went with some used Paradigm Studio 40 v.2's which are somewhere in between...very balanced. If you're not married to the idea of towers, Studio bookshelfs would be a nice upgrade from the Polks, I think.