I mostly use the Sony A 6300 with a custom profile to my liking, but I always correct on post, otherwise video might by lacking contrast etc.
There is always a debate about 24 or 30 fps and super 35 or not because the camera down converts 6K to 4K for video.
(I wish we had 6K recording!)
Go for maximum bit rate at 100 Mbps in 4K.
It needs a UHS grade 3 class memory, otherwise it can only record 4k 60Mbps.
If you are not going to color correct, try to stay to one of the nine preset profiles PP1-PP9.
The last ones though are used for S-Log but all can be changed or copied to another place and then back to reset if needed.
I personally avoid S-Log and have customized a Cine profile.
You can live preview every change you make.
Avoid setting sharpness high.
Play with Black Level to find your setting.
If you over do it with Black Gamma to raise shadows you will end with visible noise even at 100 ISO in daylight.
Search on sub menu for KNEE setting and change it to manual, it does not work in auto.
It makes a huge difference in avoiding burned highlights.
Avoid under exposure and you will have less noise even at high ISO.
A6300 is a camera with very good detail but terrible rolling shutter in panning shots, with the problem more intense if not using stabilized lenses.
Also, if not on a tripod, warp stabilizer on Premiere deteriorates quality also resulting in a less detailed picture result. 
(My one inch Canon with small sensor has no such problem at HD 60fps.)
Adobe Premiere might stutter when correcting LUTs even with a fast processor, plenty of RAM and CUDA cards.
People say paid DaVinci Resolve is better in this area.
Since you will not be using an external monitor, use your Premiere Vector scope to see if your video has crushed blacks or burnt highlights.
It will also be a great way to fine tune your custom profile.

With regards to previous posts, does anyone know if Shutterstock will accept DNx?

I prefer 30p but most would argue you should record at 23.97 either for cinematic quality or for acceptance purposes.
Yes, highest quality is at XAVC 4k 100 Mbps.
You create a Premiere timeline and then you export at say Motion JPEG.
There is a previous post where we have discussed all the details you need
http://www.microstockgroup.com/general-stock-video/adobe-takes-away-photojpeg-and-it's-all-a-mess-again/msg510592/#msg510592

For me, apart form rolling shutter, a problem sometimes are blue sky macroblocks during rec which might be more prominent after color correction.

Then again more expensive or "dedicated" video cameras from say Canon like the C100 I have tested have the same problem.
I don't know about the Canon C200 since I think it is a 10-bit 4.2.2 camera.

How useful is the 50p setting in AVCHD? it might end up giving some more frames and better smoothness to the video at the loss of more time in post processing