That is interesting. Maybe the microserrations on a honed SR work better in grabbing the whiskers than a coated, non serrated (by additional coatings etc) DE blade.
No, I don't think so. One of the blades was great on the first shave and as smooth or even a touch smoother than a straight (certainly comparable) then ok on the second shave and failed on the third.
The other blade tested was not sharp enough on the first outing meaning it was not as sharp as the straight. Other blades may fair better.
I'm pretty sure a good majority of them would be comparable for a couple shaves at least.
I'm also pretty sure some are not.