Depends: If you keep the rubber ring that's placed underneath the pads it will actually increase lows and further remove highs vs stock Q40. However the bass quantity you get is of pretty poor quality, makes the beautiful textured but strong bass response of Q40 lose some of its texture and I don't think it's a good idea to further decrease the highs either. If you remove the rubber rings with the Hifimans you get the opposite, a bit less bass and more highs instead. Isolation at least for me is also pretty poor with the Hifimans but pretty nice with the stock pads, a really huge difference for me.
Have you tried the shure pads