C of S was still part of the transition to a true RUSH sound, IMHO. A journey they started and completed with the polished and complex arrangements in Xanadu using synthesizers ....the final RUSH sound of their OWN had arrived on Farewell to Kings (rather than the too obvious heavy influences of Led Zeppelin on their earlier stuff.)
Xanadu is amazing stuff for a three piece band...the live version of Xanadu on Exit Stage Left is perhaps the most impressive variety of sound from a three piece band that I have ever heard.
Does anyone have the DVD of Exit Stage Left, is it any good sound wise? - I am thinking of getting this? (Rush in its absolute prime)
Currently, I am watching Razorlight right now and looking out for their next album (if the band can stop fighting on stage and stay together!) So far, they do not have a sound of their own but like Rush they show remarkable promise on their first two albums...