Don't normally do this as, well quite frankly, I worked in a camera shop for twenty odd years so should be able to sort it myself and the responses tend to be a little (shall we say) random or more often very personal - but - I'm after opinions in general.
I have both Nikon and Pentax DX outfits and I'm after an upgraded body - Full Frame is out of the question due to cost so you can rule that out straight away.
Currently running a Nikon D300s which I love to bit, its an epic machine, its performance as a body is faultless but the sensor is vastly out dated and I increasingly get disappointed by the files from it. Not complaining really as I've had great use from it but it needs a refresh.
The other system is based round a Pentax K30 which at first glance is miles off the Nikon's performance but its weather proof, skips along at 6fps, has a 100% viewfinder (three musts) and is really neat for a DSLR so great to carry around day to day. The sensor is still a few year old (its a Sony 16MP variant) but it does well - thing is there's a fault developing which according to the net (don't roll your eyes) is a known one and ultimately fatal.
Lenses wise I've a couple more to fit the Nikon than the Pentax but don't use them all on a regular basis so don't miss them when I carry the K30.
The cameras I'm looking at are very close in basic output, pretty much the same sensor. The D7200 has the best AF, I do like the control layout and I do have more lenses for it. The K3 II has a far more versatile multiple exposure option, something I use quite a bit to blur water and it has in camera VR which is fantastic in general and with primes where you get large apertures and stabilisation its amazing. The Nikon has Wi-Fi which would be nice as I'm an Apple geek so could link to my iPhone/iPad I've a pair id Speedlights which I can control with it - but the multi exposure is rubbish (both my current bodies are far better) and the Live View is 3rd rate at best. The K3 II has GPS which when used with the in camera VR allows longer than normal exposures when shooting start to stop trails - pretty darn cool and you can shoot up to 2000 shots which it can then combine onboard - no Wi-Fi which is weird on any 2015 device and to fit the GPS in they've got rid of the built in flash so no easy wireless control.
I could go on and on and on and on so would appreciate a bit of input, musings, how abouts and general feedback.