Just sharing an observation of the 737-800’s VREF calculation speeds in-sim, following a screenshot I took from a recent Justplanes upload of the same variant.
Real 738 FMC:
PMDG 738, with identical gross weight and fuel:
Going by this example, it seems that the VREF speed calculations are 2-3kts faster in MFS, which I think a lot of us had that gut feeling about. It’s not very far away of course, but just adds to the challenge of landing at the likes of Jersey, Skiathos, etc. 
… It has me wondering if this is just a general inaccuracy or was adjusted deliberately by the devs to give the correct pitch attitude in MFS’ flight model?
Of course, I’d have liked to use some more real-word samples to do some further comparisons, but this info isn’t easy to get (unless you just-so-happen to fly the 738 irl :wink )
Keen to get some thoughts on this - especially for those who own the -900 (which I don’t have) . Are you seeing a similar variation?