Not only do you get better depth of field, but you also end up using larger focal length lenses to get shots done. On a crop sensor, you have to use a 35mm lens to get what a full frame gets done on a 50mm. Of course, the 50mm lens produces better bokeh. So not only are you getting a nicer amount of bokeh due to the thin depth of field on the full frame camera, but you also get better bokeh due to how you get to use each lens.
Of course, you could take this logic to the extreme. You could say "well, then there's medium format... it's like another step up". Medium format is to full frame as full frame is to crop sensor, to put it into simpler terms. At a certain point, you have to pick how thin of a depth of field you want, and how large you want to go on your lenses. Also, the pockets only run so deep for anyone.
The reasons why I want to move to full frame at some point are as follows:
- thinner depth of field (Bokeh!!)
- better lens options (50mm = 50mm field of view!!)
- way nicer high ISO performance
- better build quality, controls, built-in features, focus system, & weather-proofing (of course, most of this could be had with a D7100 as well
Remember that there are a couple upsides to crop sensors:
- larger depth of field: sometimes you want this, so you can shoot at f5.6 or f7 without excessive out of focus areas
- crop factor: this is often desired, you get more reach