The Nikon D750 offers a compelling feature set for its price point. If you care about image quality (particularly Raw), as well as the AF tracking capabilities that only a dedicated PDAF system with input from a separate RGB sensor can provide, then this camera literally has no competition at this price point. Save for the D810, which is more expensive, and – at least spec wise – may not offer the low-light AF capabilities of the D750 (we’ll have to verify this in testing, though).
On a personal note, I myself am torn between the D750 and the D810. On the one hand, I want the resolution & dynamic range of the D810 at ISO 64*. But it boils down to that EV -3 rating for the AF system. I’ve found the D810 to struggle in low light with low contrast subjects.
And, yeah, ditto what TravelPhotog above said.
*Don’t quote me just yet, but, the D810’s Raw DR at ISO 64 approaches that of the Pentax 645z at ISO 100 in some of our tests thus far. That is no small feat.
Started out doing photography at the age of 6 using an uncle's old 1940 kodak brownie box camera. At 15 years of age, I decided to buy my very own 1975 Praktica SLR camera. I now shoot with a Nikon D850. I do unpaid TFP and commercial paid work.