Nikon D750 Review & D750 vs Nikon 610 and 810
I have been shooting with the Nikon D750 for the last month and it is time to share my thoughts with you.https://www.youtube.com/watch?v=oOC7D6U-Xp4 
D610 Offers an excellent sensor for just $1500D750 Offers a versatile camera that excels in low light focusing and produces very clean images at high ISOsD810 offers 36MP with no optical low pass filter (OLPF) this gives you stunningly detailed images 
D610 and the D750 share partial MA Skeleton. D750 gets carbon fiber exterior increasing strength and decreasing weightNikon Full Frame DSLR Weight:
- D610: 1.87 lbs (850 g)
- D750: 1.65 lbs (750 g)
- D810: 2.16 lbs (980g)
One of the headline features of the D750 is the articulating display. The first full frame DSLR to offer. There is some nervousness surrounding the ribbon connection powe to the screen and yes an articulating screen is more prone to issues but all in all the additional angles you can shoot at without craning your neck or guesstimating on the composition are appreciated. The D750 is the smallest of the three and like the D610 some buttons on the left have dual purposes depending on the mode you are in. I find this to be slightly annoying The D810 has a dedicated button for almost everything and includes a dedicated AF-ON button too. 
The D750 has the newest focusing system of the three cameras with excellent performance in low light. Same points and spread as the D810 but with better low light performance. D610 is capable but not my first pick for speedy focusing when the light levels drop. 
My Favorite features of the Nikon D750
- AutoFocus Performance
- High ISO & Lack of Shadow Noise
- Video Performance
- Size & Weight
- Articulating screen
- Wifi
A few small items that I don't love about the D750.
- Grip
- Two Handed Control & dual purpose buttons
- Smallish Buffer (fastest fps)
- Video limit to 20 min at 1080p (30min at lower resolutions)
- Separate settings for live view
- AWB isn't perfect (more inconsistent than I would like)
Overall I would be very happy to use this camera professionally.