I'm sure you know my opinion of the fp L by now...

But if you can live with the limitations of no IBIS and a slow electronic shutter then it's hard to beat in terms of absolute image quality.
One potential issue, though, is the software used to process the DNGs. The fp L isn't particularly well supported and Capture One, in particular, does a bad job with the colours. See DPReview on the
Sigma 16-28/2.8 where the camera was used to test the lens: the sky should
not be that colour, and isn't in the DNG file's embedded preview. I'd suggest downloading some samples from DPReview and converting them in your software of choice to check that they're processed correctly.