Bulgaria?
Welcome to AH.
I think the differences in the two KEFs will be minimal, though I have seen some folk raving about the newer Meta lines. Likewise, I have seen the occasional report of people stepping up to The Reference series from the R series and being super stoked.
The key question you need to answer for yourself is whether you like the KEF sound enough to stay within that brand.
I do not know Focal very well, though I have heard the Sopra Towers at one point several years ago... and I already shared my opinion about B&W. Focal's upper tier Speakers are generally well regarded.
I do agree with
@AcuDefTechGuy and suggest that if you cannot listen to the Speakers, choosing an upgrade at that price point is risky.
Are these really the only options you have access to?
The R3 is no slouch and is considered a close match to the BMR Monitors I use in almost every way with only minor points tipping the scales one way or the other. At a certain point, the smart shopper has to ask themselves if a 1-3% improvement in Sound Quality is worth the additional cost. In US, that is a $7k difference between R3 and Ref1M.
Out of curiosity, do you have access to the German brand, Canton? They are well respected and their upper tiers are reportedly very good quality. Not widely sold in the US, but there was a lower tier sold here that met with very high regard.
Regardless, I hope you find some guidance to help your decision. I still say "don't buy anything you can't listen to first or return if you don't like it!"
Happy hunting!