I am wanting to upgrade from my T4i to a better spec'd camera. Instinctively, I want to go FF with the 6D, by all accounts a superb camera and will give me the vastly improved low light and IQ that is so lacking in my T4i. Prices on the 6D are low and getting lower with a likely 6D II out by early next year. Easy decision, right? It it were only that simple.
I have an infant son that the 6D would be perfect for over the next few years. But I also have a 4 and half year old active in outside sports, ballet recitals, etc. for which I know that the AF and FPS of a 70D, 7D and 7D ii would be perfect, especially with my 70-200 f4 IS.
As I see it, the PROS of the 6D are: cost, excellent low light and IQ capability, smaller/lighter than 5Diii; the CONS are: lesser AF capability than current crop cameras and 5Diii, lesser reach than crop, would have to sell excellent Sigma 18-35 Art, low FPS.
With a growing family and only being an enthusiast, budget is an issue, so I am likely priced out of 5DIII.
Here's my question: If I do get the 6D (and sell the T4i), will I regret it every time I try to shoot my daughter in sports/activities, and even my son as he grows older? Initially, I did not think so, but I played around with the 7d II and was blown away by the speed of the FPS, and having read other threads, people do miss the extra reach of the crop sensor.
The 70D looks like a very good option, but I know I will regret not jumping to FF and the improved IQ.
Oh, and last but least, my passion is shooting landscape, but I don't really have the time to pursue that and always find myself shooting family/events far more often.
Ideally I could jump up to 6D and upgrade my T4i to the 70D and get the best (average) of both worlds, but I'm not sure I can swing that with the boss!. Any advice is appreciated, especially from people in similar situations with young children and competing photography interests.