Now, here's my dilemma....as is usually the case....I'm on the brink of buyer's remorse as I read about the Nikon D3200 camera (yet again) -- mainly due to the 24MP sensor. I've begun to appreciate the articulating screen and "pinch to zoom" feature (which really is helpful for quick reviews of pics) on the T4i, but just wondering if the 18MP sensor on the T4i will give solid IQ compared to the D3200.
Can anyone help pull me away from the edge, so to speak, and alleviate my concerns?? I just don't want to be worrying that I should've gone over to Nikon.
Two things that should help
(1) megapixels don't matter that much.
The Nikon D700 is a 12 megapixel camera. Until recently (the release of the D800), it was a current model. By the way, it blows away any APS-C camera (despite the low megapixels)
(2) Sensors haven't improved substantially in the last 10 years or so (let alone in the few months since the T4i was available). Take a look at DxOMark measurements for different cameras and it quickly becomes apparent that sensor size more than anything else determines sensor performance. full frame > APS-C > micro 4/3 > 2/3 > 1/1.7" > 1/2.5". Sony might be able to produce a 24 megapixel 1/2.5" sensor but it's no match for a 12 megapixel Nikon D700 or even a 10 megapixel Canon 5DC.
That's why professional grade cameras are on 4 year release cycles. Until this year, Canon's 5DII and Nikon's D700, both 2008 cameras, were current models.