B&W cm8 as fronts bw mt50?

This week i ll heard the new b&w mt 50 system and they sounds very good.

Question: i ll think to buy the system and replace the l/r fronts for the B&W cm8. Will this be a 

usefull upgrade of the mt 50 system and will this be an upgrade for the sound experience?

The av receiver will be the Denon 2312.

I hope you can help me with this and finally is this change the extra investment €1k worth?

thanx 

sander