Well bigger speakers have an advantage over smaller speakers when everything is equal or better. A bigger speaker works less to do the same thing as a smaller speaker. The rf-62 will have to work a litter harder to play at the same levels as the rf-82. What that means is less distortion and a little cleaner bigger sound with the same amount of power.
Thats not saying its a better value just a better speaker. Only you can say if its worth the extra money.
Klipsch Pro Cinema KPT-904 L/C/R, Pro Cinema KPT-1201-T2 for sides and RB-61 II for backs.
SVS PB13-Ultra, PB12-Plus x2, and Velodyne SMS-1 Sub EQ
SC-55 elite and B&K 200.7 S2
JVC RS-45 Projector, and Seymour CS 125” 2.35 screen
Oppo BDP-103 9 ATS Acoustic panels