Now if you're talking better AF and 100% viewfinder
Can you give me a quick hint why a 100% viewfinder is so important? Because for out-of camera shot presentations? Personally, I often crop my pictures in post anyway and a less than 100% vf gives some margin for framing errors.
Isn't it sort of logical as to why it would make sense for you or not?
Of course a usefulness of dual card slots is obvious. However it's not a straight-forward decision for me buying a 5d2 or a 5d3 at double the price I can hardly afford - I wouldn't ask about these things otherwise. If I want to try to get into pro shooting, my earnings will be low at the start for certain, so I have to invest the money I've saved soundly.
There is certainly no single feature on the $3500 (wtf!?!?) 5d3 that would make it "worth it" to me, as far as I read it above also not the dual card slot. The question I have to think about is if all improvements added make it "worth it" or if it's more "worth it" to get a second 600rt and lighting gear.
Money is relative. Running a professional photography business is not easy, and it can take years to actually make a living from it. What is "worth it" to anyone really?
I had the 5D Mark II for three years, and I just recently go the 5D Mark III, and to me, it's worth the money, absolutely. $3500 isn't that much money when you're talking about cameras like this. Sure, it's expensive, but it is worth it for many people.
-Dual Card slots
-AF system that is like 100 times better.
-Faster shooting/frames per second
-better movie features
-better high ISO abilities with less noise
-way less color shifting at higher ISOs, this is also very nice. the 5D2 gets pretty gross color shifting at higher ISO
-slightly better image quality at lower ISOs as well with slightly more dynamic range
-more customization for buttons (this is a big deal if you're a full time shooter, definitely a big impact)
-more in camera features
-the customization for things like the AF points and positions, again, big deal
-feels better in the hands, better ergonomics
-silent shutter mode = amazing for many situations. it's VERY quiet.
-better in camera lens corrections
-again, more customization to specific AF traits
-better jpeg processing (I don't shoot JPEG though, so this doesn't mean anything to me)
-much nicer viewfinder, brighter and can show you more information. Feels more "clear", which is nice, especially coming from shooting lots of medium format with film. Those viewfinders are gorgeous compared to most digital ones.
-the 100% viewfinder is nice, actually knowing the exact edges of your frame is excellent. I'd rather get the shot JUST right in camera than need to crop.
-faster response time to pressing shutter button
-better weather sealing
-tracking is much better, not only because of the crazy good AF system, but SERVO is definitely improved
more in camera features, again, like the rate button and further button customization.
I have the SET button changed to switch ISO with the top wheel. So now I can switch ISO, shutter speed and aperture in less than mere seconds without taking the camera away from my face, in intense situations this is extremely powerful. I have the (better placed than the 5D2 for sure!) DOF button set to switch from ONE SHOT to AI SERVO, again, without doing any movements or taking the camera away I can easily switch, which is amazing for action and things like weddings or concerts.
I back button focus, which feels slightly better now too because of the camera body being nicer in the hands. switching between AF points is nicer now too. And I can toggle through the AF zones perfectly now. As well, I have it set so that when the camera is horizontal there is a different AF point selected than when the camera is vertical. This is also amazing for many situations. Very handy feature for lots of shooting situations, indeed.
The list of customizable things goes on and on and on! I spent nearly 2 hours tweaking and changing my 5D3 when I got it. And it's made for a powerful shooting experience.
Did I do tons of jobs with my 5D2? Yes. Did it always help me produce amazing photos? Yes. But that still doesn't change the fact that the 5D3 is vastly superior in many ways when you're looking at it from a different view point. It depends on what you're going to do with it. If you're shooting landscapes all day, then it's not going to matter. But for lots of people (weddings, concerts, documentary, portraits, sports, journalism) the choice is a little less clear because it really depends on you. I'll keep my 5D2 as a back up, but after shooting a few jobs and weddings with the 5D3, I can easily say that YES, it is worth it for me.