There are those, myself included who find a single studio twenty superior to the cc center. With three identical speakers up front the sound stage is seamless. I did the test of the CC center and a single studio 5 - 6 years ago at home. The specifics I remember is the CC just sounded like it did not match the 20s. Like it was from a different speaker brand. Swap out to a single 20 as center, and I found sonic bliss. The best "tweak" I ever did, and the 20 was about half the price of the CC center too!
I know a lot of people who are very happy with CC centers and that in their homes and using their equipment that get excellent results with the CC center. This is just my two cents.
Nick