What I meant was that I am a bit overwhelmed by the amount of sub-bass. It's not IE800 quantity but it's definitely too much for my taste. However, the bass does not color mids as warm as the SD3.
So it depends: the SD3 has (much) more bass, but not as fatiguing. The FA4 has a cleaner (or more lightweight) transition from bass to mids but can be fatiguing with the amount of sub-bass.
Ironically, I find the InEar double flanges to work best so far. With multi-flanges the FA becomes more enjoyable to me as both, rumble and highs, are taken some air out of the sails.
Soundstage is much smaller than compared to SD3, no doubt. It's as wide as SD2 but flatter.
Keep in mind, this is only the second day and brain burn-in is still in process.