I used to use a Leap at my previous job, and have an Embody at home. I tried the Aeron at a store prior to purchasing, didn't see what the fuss was about.
Overall I like the Leap and Embody a lot. From what I can remember about using it, the Leap v1 had a few more adjustment points than the Leap v2. Both v1 & v2 were comfortable, had all the adjustments I needed to get proper ergonomics. I ultimately picked the Embody for home because while the Steelcase was good, I didn't want to spend 8 hours in the work chair and come home to sit in the exact same chair.
The Embody is definitely more of a flexible chair, you feel it move when you move in it. This has the side effect of feeling like you'll tip over if someone stands behind you and puts weight on your chair back (e.g. shoulder surfing and resting on your chair back). I don't like the arm adjustments as much as the Steelcase v1 Leap, there's no angling -- it just gets closer to you as you raise them up higher. Overall the Embody is very comfortable, and with working from home I use it 8-10 hours a day now. It holds up great.
What a coincidence, I also have an Embody at home + use the Steelcase Leap at work. I can confirm that both are outstanding (and better than the Aeron).
Overall I like the Leap and Embody a lot. From what I can remember about using it, the Leap v1 had a few more adjustment points than the Leap v2. Both v1 & v2 were comfortable, had all the adjustments I needed to get proper ergonomics. I ultimately picked the Embody for home because while the Steelcase was good, I didn't want to spend 8 hours in the work chair and come home to sit in the exact same chair.
The Embody is definitely more of a flexible chair, you feel it move when you move in it. This has the side effect of feeling like you'll tip over if someone stands behind you and puts weight on your chair back (e.g. shoulder surfing and resting on your chair back). I don't like the arm adjustments as much as the Steelcase v1 Leap, there's no angling -- it just gets closer to you as you raise them up higher. Overall the Embody is very comfortable, and with working from home I use it 8-10 hours a day now. It holds up great.