yes and no, the shape is slightly bigger than the press steel sump's, but due to the thickness(displacement) of the cast-in baffles and the fact that is has a thicker wall than a pressed steel one it doesn't noticably take anymore oil to fill it. If you fitted one of the aluminium windage trays then they actually get your sump sitting 2/3mm(ish) lower which means you get that extra distance on your dip stick hence allowing you extra capacity, but the trade off being that your pick-up on scavenge of the oil pump now sits futher from the base of the sump, thus reducing is scavenge ability. Which leads to another problem, that by having the sump sitting lower with the wingage tray(and due to thickness of alloy sump mating face and walls etc) the drivers side inboard CV joint was rubbing the sump, so found myself in the dilemar of dress away some of the sump or not fit the tray, needless to say I kept the sump in tact and ditched the tray at that stage!
