Yes I know it's been done to death, but after missing out on a good priced 24-70 again and people pricing various aged 24-70's for £100 less than a new one due to the demand I'm sick of chasing them as I know I'll be outbid with a higher offer. Now using a 5dII so I'm not afraid to push the iso a bit or use external flash, so am I best just settling for a 24-105 saving £200 but losing the extra stop, or is f2.8 really worth that much?