I have LCD 2F now, before I owned Ananda, DT 1990 few years back so I will try my best but I will be brief.
LCD 2F:
Bass: Goes slightly lower, Bass is very clean on LCD 2F, I normally use slight bass boost on it about +3db from 100hz down. When there is bass or rumble, it sounds extremely clean and it sound like it is everywhere, but to me it lacks impact. There is more bass on T1 than LCD, but bass sounds different its easier to pinpoint, it also hits harder.
Mids: Sounds very similar both headphones have recessed mid range from about 1khz, LCD slightly more than T1.
Highs: I do not like highs on LCD, they sound thin and slightly metalic. It is my least favorite part of the headphone, you can hear them but I do not consider them being of a good quality. I was forced t use equalizer to be able enjoy this headphone, 6k peak for me was too much for me. Highs on T1 are more detailed but at the same time much easier to listen, they have certain body to them and they sound right without any brightness.
Soundstage: About same
Detail: T1 all the way, more precise much more exciting.
Overall, without equaliser T1 for sure. After equalizing LCD it gets much closer and LCD holds its own. But they both have very different sound signature. LCD is very relaxing where T1 is like party animal
Ananda:
I have to say I really like this headphone, but I did like HEX v2 more. Due to comfort and better bass.
Overall I do like Ananda a lot,I think it is great headphone which sounds very clean, it has great vocals and very good highs as well. Out of those three this would be the one I would pick if I had to take only one. In general I was pretty happy with Ananda. The only thing I did not like was imaging, ananda has very good soundstage but I always had trouble to pinpoint certain instruments and I would prefer slightly more bass again about 3db, and I did like HEX v2 headband more than Ananda but I feel Ananda was better build.
Compared to T1 they do not share much. T1 is more intimate experience, more bass, more details, very precise. Ananda on the other hand is really well balanced, it sounds great but it lack certain excitement. Ananda sounds much more open, where T1 sounds much more precise and focused.
DT 1990:
I think T1 has about same amount of bass as DT 1990 with balanced pads. I did prefer to use DT 1990 with analytical pads, as I found bass and mids to be extremely well balanced. Where it did not work for me were highs, they were of better quality than LCD but they were just too sharp for me, I could not stand them.I do not remember exactly where there was peak but in general I am very sensitive between 5 to 7k and much less in 8 to 10k.
T1 has slightly more fun signature, and it feels like it is technically better than DT 1990. It has more and better detail than DT 1990, but difference is where DT 1990 was harsh and sibilant, T1 is sweet and enjoyable. I also prefer comfort of T1 because in DT 1990 there was thick foam which was touching my ears, that did annoy me alot
. In T1 damping is much thinner and due to angled driver there is more space.
DT 1990 with analytical pads more balanced sound signature up to about 4k. From there I would give it to T1.
However there is one big difference between two. T1 portrait soundstage differently. its much more in front and deep than DT1990. They also sound different overall, it is hard to explain for me, but T1 sounds really well damped, at first it might feel like its not very open, but its not the case, it has amazing detail, imaging and precision everything feels very cohesive and has its place. DT1990 due to treble peaks sound airier but also drier.
Hope this helps, also please note I have got T1 today so I had limited experience so far and I have to admit it is hard for me to remember every detail from every headphone in the past. I do remember well their biggest strengths and weaknesses but it is hard for me to go into every aspect without knowing that I might not be 100% sure.