Right now it costs around the same used to get these two kits:
Nikon D600 + Sigma 35mm f/1.4 HSM
Fujifilm X-T10 + Fujinon 23mm f/1.4 (or a fixed-lens Fujifilm X100T).
The biggest tradeoff is compactness for sensor quality.
There are lots of situations where you would lose pictures on the mirrorless kit that you might have gotten on the SLR kit (nighttime, concerts, buildings). The other way around it is not so clear.
The word on the street is that mirrorless cameras are less obtrusive than SLRs, but I am not sure I believe this. Is a full-frame SLR gawdy enough that it justifies foregoing sensor quality?