FWIW, below is what I posted on Vintage Rocker a few days ago when asked the same question. After having played my Standard for nearly a week now, I think I can safely say that I actually prefer it over the regular DGT. Anyway, here goes.......
Well, I'm still in the honeymoon stages with my Standard, but I also have a DGT Sig (maple/hog) as well, and there are definitely some tonal differences between the two. I don't know that I like calling the maple-topped DGT a Sig, but I will here for comparison sake.
When I first got my DGT Sig, I instantly noticed that it was a little on the bright side for my tastes. After reading descriptions and hearing clips of what others have said and done respectively, I concluded that my Sig was indeed a little brighter in tone than many out there. This probably isn't a bad thing, but when comparing my DGT Sig to my McRosies, I felt I needed to make some adjustments to fatten up the tone a bit while reducing a tad of high-end as well. As a result, I installed a pair of 59/09 pickups, and this seems to have helped in many respects, especially for the bridge pickup.
Then, last Tuesday I went to pick up my DGT Standard. Once I got it home while plugging it into my own amp, I instantly noticed how much warmer and darker the Standard sounded compared to the DGT Sig, even though the Sig currently has the 59/09 pickups installed. At first I thought I might need to brighten the Standard up a bit, but the more I played it, the more I realized this probably wouldn't be necessary since I have plenty of high-end as well as more than enough in the low-end. The DGT pickups in general seem to have little softer and more rounded feel to them than many PAF-style pickups (perhaps boosted lows and scooped mids in the DGTs?), but the Standard seems to naturally bring out some nice mids while the lows sound a bit on the spongey side to me, but certainly not what I'd call muddy. It probably wouldn't be a guitar that I'd want to use for some tight, low-end crunch with the stock pickups, but for jazz fusion or blues/rock, the DGT pickups could be the ideal matchup, for they really do sound very nice when playing these styles with this guitar. While I'm sure the Standard could be used for harder rock styles just as it is, too, I also feel quite certain that if I wanted to beef this guitar up with some of the hotter A5 PAF pickups that are out there, it could rock with the best of them without losing any inherent tonal qualities of the guitar.
Both guitars are all PRS in the sense that they both contain all of the sustain and harmonics that we've grown to love in these instruments. Upon purchasing the Standard with its all-mahogany body, I thought I might be approaching Gibson SG or Hamer Special territory, but the Standard clearly has a voice of its own while having all the PRS character that anyone could possibly want.
All in all, though, while I love my DGT Sig, I have a feeling that the Standard is going to be seeing much more gig time. Of course, I'm sure others will share their own experiences that could certainly differ from mine, but I hope this helps a bit.