Yes, very happy with the Studio 4s. It took a long time to get there. I rewired internally using some old Tara Labs Prime 500 cables. I also rebuilt the crossovers using Clarity Cap MR and Janzen Z Superior capacitors; and Janzen inductors. I also replaced the midrange units with Monacor SPH 135 KEP (kevlar) drivers. I fitted some Fostex attenuators to balance these with the bass units. The tweeters were replaced with Eton 25mm units. I think rebuilding the crossovers gave the greatest benefit, though due to the size of the components I had to fix them on sheets of light ply and mount on the back of the speakers. I have much more detail overall, particularly in the bass where I have used Janzen 8,2mH 12awg inductors. I also found upgrading to TQ Ultra Black cables well worth while.
Not sure whether I have heard the Polks you have so no idea how they would compare?