I doubt you'll see much difference between 4.2.2 and 4.3 unless HTC have modified Sense. The only reason that 4.3 is an appeal on the Nexus 7 for me is that Google has altered memory management and it no longer lags - I've not seen this issue with the One.
Previous Phones: HTC Google G1, HTC Hero, Nexus One, Nexus S, HTC Desire HD, Samsung Galaxy SII, HTC Sensation, Galaxy Nexus, HTC One X, Nexus 4, HTC One
Previous Tablets: Motorola Xoom, Nexus 7.
Current: Nexus 5, Sony Tablet Z LTE.