So I recently switched up my camera system from a crop sensor to a full frame camera! Why did I do this? Well the D7200 that I was using before was an amazing camera that captured beautiful images, and I honestly could not have been happier with it... until I ran into any kind of low light situation where I found that after ISO 1600 it was already starting to get way too grainy for my taste. On top of that, the camera was starting to give me some issues that were starting to worry me. This was all happening around Black Friday and some of the Nikon Full Frame cameras were at an all time low when it came to price, so I decided to sell my D7200 and make the jump to full frame. I ended up getting a D750 which is an extremely popular camera among pro photographers. Both the D7200 & the D750 have very similar bodies and button layouts. They also both have a 24 megapixel sensors so I was right at home using the D750. Its amazing the kind of low light capability that I've already gotten out of the D750, and some of the lenses I was using on the D7200 are completely different on the D750.
I am in no way saying that the D7200 is a bad camera, and I would HIGHLY recommend it to anyone who wants a professional body with a crop sensor. The D7200 is perfect for outdoor portraits, sports, and wildlife! I would've never given it up if it wasn't giving me issues, but I can say that it's low light capabilities have nothing on a full frame sensor. The D7200 even has some advantages over the D750 such as a maximum shutter speed of 1/8000 of a second which is useful for sports and wildlife. The D750 only goes up to 1/4000 of a second. The D7200 can also achieve a much higher ISO, although I don't find it usable it's good to have it just in case. Both cameras are amazing and it really just depends on what kind of photography you want to be doing. If you are someone who will primarily be shooting weddings, events, and portraits I would HIGHLY recommend you look into a Full Frame sensor. If you want to shoot sports and wildlife maybe a crop sensor would be better for you, and the added range on zoom lenses would also be important for these types of shooters. Of course with sensor technology advancing even some newer crop sensor cameras do very well in low light. The D7200 did get me through a few weddings without issues, but I did have to use an external flash on camera.