Eclipes, let me know if you try any other filter settings. I'm curious if there's a noticeable difference with any of the others. I did notice a difference between the 2x brickwall and the 8x min phase apodising, but just not between the 8x and my other DACs, which still surprises me given the varying age of the DAC's (even if they're all high quality for their time).
Given that I can't tell the diff between DAC's, I really doubt I could tell the difference between two different DAC's using the WM8741, so at least I'm glad I didn't spend more on implementations using higher end PSU's or caps!