Yes, they're significantly brighter than this year's E-series Samsungs (which may have been intentionally limited in brightness according to cnet, since they can't match the D). In fact, this year's Panasonics are also much brighter than Samsung's D series. Don't think it has anything to do with the filter.
BTW, it was also recently revealed that the cell setting on Samsung plasmas is a bogus control and the best setting is the maximum (20). There's no need for it anyway because you can control the peak output with brightness and contrast just fine, however with cell at 20 and peak adjusted to something not obnoxiously bright, you will have a harder time with grayscale calibration (misalignment of 10pt controls) unless you make adjustments in the SM using the emulator.