TB Display brighter than Cinema Display?

I just bought an Apple refurbished 27" 2013 iMac. I am using it along with a 27" Cinema Display that I previously used with my much older 21,5" iMac. The new iMac display goes considerably brighter than the Cinema Display or my old iMac (My desk is by a window, so in the afternoons extra brightness is helpful!). So i was wondering if it was worth replacing the Cinema Display with a TB Display. But on paper, the TB Display does not go any brighter than the Cinema Display; can anyone say if this in true in "real life"?