I just have this feeling that after getting the 24-70 II, I really won't use the 24-105L at all...and if that's going to be the case, why not get the new zoom that much sooner?
I'm sat here at the moment just thinking about the 24-70mm 2.8 II - I've still to sell my 10-22mm which was replaced by the 16-35mm on the 6D, I'm not using the 70-300mm since I bought the 135mm - cropping into a shot taken on the 135mm really is better than anything taken on the 70-300mm (non L) and then pondering about would I really use my 50mm 1.4mm if I got the 24-70 ? Probably less, if at all...
Need to stop looking at these threads, ou guys are costing me serious money ;-)
an uncontrollable desire is a terrible thing 
i've recently purchased the 135L and love it to bits.
my next purchase when money allows (end of the year probably) will be either the 24-70 2.8L II or the 35 1.4L. i seriously can't decide which to go for. i love primes but a standard zoom is missing from my kit...what to do what to do? 
then of course there's the thought in the back of my mind that possibly a replacement will happen soonish for the 35L. but i guess you can't go on thinking like that...
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lastcoyote.. I am in the same boat .. I have the
Canon 5D Mark III | 40D |35 F1.4L / 24-70mm F2.8L MKI / 24-105 IS F4L/50 f1.4 | 100 f2.8L IS Macro | 135 f2L | 70-200 f4L IS | 580EX II/KENKO 1.4x and Canon 2x III
I have the 70-200mm 2.8 IS MKII and a 430EXII on the way ..
I want the 24-70 MKII ( already getting rid on 70-200 F4 IS (since 2.8 is on it's way) was thinking of getting rid of 24-70 MKI and keeping the 24-105 but looking at how good the 24-70 MKII is considering selling both and 50 F1.4...choices, choices..aaarggg.
I have purchased a 24-70mm 2.8 MKI, 135mm F2L, 100mm IS F2.8 Macro, 35mm F1.4L, 1.4x Kenco and 2X III teleconvertors and now the 70-200mm IS 2.8 IS and a 430EXII in less than 4 months...just for vacation shots and family photos.. explain that one to your wife (That's after buying the 5D MKIII for my Christmas gift to myself..lol)
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