Here is a round-up of hands-on reviews and previews of the brand new Canon RF…
[Review] Rebel T4i/650D vs. Rebel T3i/600D
At borrowlenses.com they made a short comparison between the Rebel T4i/650D and the Rebel T3i/600D. The comparison is made side by side. Watch and judge for yourself. Btw, the Rebel T3i/600D may be available at reduced price since the T4i is out and shipping. Check the live-ticker below for possible T3i bargains.