Hi, I want to upgrade my D300. Photographing birds with the D300 was always a challenge due to poor ISO performance at 800 and above, and the 12 megapixels are too little for photographing small birds which are some distance away (especially since I want to make prints, 12" x 18" and 16" x 20"). Photographing small birds is one of my primary objectives in the coming months. At the moment, the D750 is my #1 choice. I do environmental portraitures too, and miss the field of view that a 50mm lens brings on a full frame body (a 50mm lens is all that I ever needed back in the days when I used film). But the D7200 costs significantly lesser (almost half). I can get the D7200 and Tamron 180mm macro for the cost of a D750. However, does the IQ of the D7200 match up to the D750 at say, 6400 ISO? I will make my final decision purely on the basis of IQ at high ISO values. I look forward to your insights.