This is my first real impressions write-up, sorry if I miss anything. Obviously this is entirely subjective. I started this as a versus sort of thing, but they're both awesome and I ended up just adding some of my notes. Take it how you will.
I did not use the filters in the AFO during my listening, but did use the Norne cable. I used my laptop / Spotify to iFi Micro IDSD Black Label.
Construction: The AFO is definitely well built, but is a bit plasticky when placed next to the tank-like LCD-2C. They are both comfortable, but do clamp a bit on my (I guess) bigger than average head. That said, both are easy to wear for long periods, with the ALO edging out the LCD-2C due to the lighter weight.
I'll list the song title and then give you my impression notes for both.
Lorde - Still Sane
LCD-2C: Good seperation, highs hurt a bit, impactful bass. Very clear voice with these.
AFO: More laid back (not as articulate) and easier to listen to this song with. Bass less controlled though.
Hallelujah - Tori Kelly
LCD-2C: Detailed, but a bit picky with this song.
AFO: More forgiving (especially the instrumental part), smoother with her voice.
Once Upon a Dream - Lana Del Ray
LCD-2C: Heard more going on in the background, almost hearing too much. The rumble sounds awesome.
AFO: Good balance of voice and background. Overall more haunting (which this song is supposed to be).
La Grange - ZZ Top
LCD-2C: Instrumentals are excellent, with the vocals detailed too - super fun to listen to with these.
AFO: More laid back/not as much energy. Voice and instrumentals more blended.
Easy - Sky Ferreira
LCD-2C: Voice not as forgiving. Instruments overpowered vocals a bit with these.
AFO: Relaxed and easy (see what I did there?) to listen to, ethereal quality.
Harry Potter Prologue - John Williams
LCD-2C: Can hear the instruments being played, extremely detailed. Highs a bit harsh. Great low end strings blending in as song progresses.
AFO: Can also hear the instruments being played, but not as precisely. Highs not as harsh. Sound more blended - individual instruments do not stick out as much (not better or worse, just different).
These are both excellent headphones that have their own individual strong points in differing music. I think they complement each other and don't find owning both of them redundant.