I have just got the canon 5d mk 2 well hopefully Monday it will be here and own the canon 17-40 lens.
I am not weather to get the 24-70 2.8 or the 24-105 i know the the 2.8 is more expensive approx $300 ,i will use the 17-40 for landscapes and was thinking the 24-105 as my walk about lens but the 2.8 looks amazing what do you think?