Well, the Focal look prettier with their walnut veneer and flax woofer’s, so the choice should be easy
I’ve listened to both some years ago at a music shop, and they were of course positioned somewhat differently, so take what I write with a bit grain of salt…
Both sounded good, but different to me in that scenario. I really liked the stereo image of the Focals, very impressive. The KH120 (i think it were the original ones, not the “a”) maybe sounded even more neutral, to the point of being rather unimpressive at first compared to some other speakers.
The Shape65 have a more extended low end (-3dB@40Hz compared to 52 for the KH), apart from that imho both are great monitors and you cannot really go wrong with either. Matter of taste and/or just getting used to.
I personally just fell in love with the Focals, although I ended up buying the Shape50s, because of money and better fit for the intended purpose/setup (smaller). If I’d have to decided again, I’d probably get the bigger ones.