I am not a Focal Naysayer, but I have had them and want to try something different.
I had K2P's in the front of my last truck and they sounded great, but to make them sound the way I wanted I was attenuating everything from 8K to 14K with an equalizer.
for an idea of my taste I previously had MB quarts, which I really disliked (harsh) and replaced with some Diamond components (in '99) that really sounded good - I don't remember the model. When I upgraded to the Focal 165K2P/ 165K combo in late '04 I was impressed with the sound quality, but for the money (retail) It wasn't what I expected.
I initially tried running the Focals with 2 MRV-F540s bridged, and the sound quality was good - and loud, but weak. Any major midbass and the amp would distort.
I put in my old trusty (rusty?) Mmats LM2120 amps from the 90's and they sounded much better, no more distortion - at least not at the levels I listen too. Those speakers need some power.
The Focal's did great with Dire Straits, ZZ-top, and most rock - but I mostly listen to Techno - which is frequently distorted during mastering - the Focal tweeters would take that recorded distortion and make it into a shrill that literally made your ears feel like they were going to bleed. Other speakers in the past did not have that effect with the same music using the same HU and amplifiers.
I am going to try the DLS Iridium 6.3's I think they are probably lower on the food chain than focal - but I am hoping that with the silk tweeter and midrange they will be more to my liking.
Sound quality is so subjective. You can achieve a flat response with a calibrated disc and a RTA, but that doesn't mean it will sound good to you.