Focal Utopia monitors: Diablo vs. Micro Be

I have a pair of Micro Utopia Be speakers (complemented with a REL Stentor 3 subwoofer) which I drive with an Accuphase combo, i.e. the E-550 amp together with the DP-500 cd player. I like the speakers very much and I was not really thinking of getting rid of them, nor am I feeling the need for a change/upgrade. However, an audiophile friend of mine informed me today than one of his friends is selling a pair of Focal Diablo Utopia 3 speakers for about half the retail price. Since the speakers are less than a year old this seems to be a good bargain.

I am interested to here opinions from anybody who has compare these two speakers. Are the differences so significant to justify a 5K (euros) investment?

Thanks!