Replace Cervelo with a Canyon?

I wondering about replacing my 2008 Cervelo R3-SL frame (think Carlos Sastre) with a 2014 Canyon CF SLX frame. Worth doing or waste of money? The Cervelo is a bit long for me but OK with 100mm stem. The downside of the Canyon is the special stem clamp size. The upside is that I suspect they are very good and cheaper than many other top end frames. And, most importantly, I like the look of them.
Pegoretti
Colnago
Cervelo
Campagnolo
Colnago
Cervelo
Campagnolo
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They're more similar than they are different - if the Cervelo doesn't fit you and the Canyon does, then that's a pretty good reason to swap.
If stem clamp size is all you can find wrong with a bike then there's nothing wrong with the bike!
But anyway, have you tried a 90 or 80mm stem? Have you had a bike fit on the R3?
Ive had a Retul bike fit. I have long legs for my height (nearly 34 inches and I'm 5-10.25) so the Cervelo is 56, the 54 at the time was too low at the front 140mm. The Canyon would be 54 M with either a 110 or 120 stem.
Colnago
Cervelo
Campagnolo
Colnago
Cervelo
Campagnolo