I tried the Hayworth Fern, Steelcase Gesture, Herman Miller Embody and Aeron. This was my experience.
So a little background. I bought my first Aeron in the late 90. Lasted me for 15 years with no issues until I had a numbing issue on my foot. I thought it was the frame causing it and sold it. Later I realized i just need a deep tissue massage on my lower back. So it was simply from sitting too much and not the Aeron. I didn't have a good chair for a few years and then i starting having lower pack issues which I never had for 15 years on the Aeron. So I wanted to buy a new chair but before I got another Aeron, I thought I should check out what's new. So i tried the following and my impression of each. I'm 6ft 170lbs
Haworth Fern online people said the lower lumbar support was aggressive, I felt it wasn't. Didn't have the build quality of the Aeron. But I felt its lower lumbar support was better than the Gesture
Steelcase Gesture this gives you that hugging support feeling similar to a car seat. So initially it feels great. But i can tell its doesn't have that center lumbar support as much as the Fern. So depends what's important to you. If you have no back issues then the Gesture is a better choice. If you have lumbar issues, the fern in a better choice. Also doesn't have the build quality of an Aeron.
Herman Miller Embody so this is one everyone was raving about. Here is why I don't like it. The lower lumbar and upper back support is all one adjustment. And the reason why this is a terrible idea for people with back issues is as you crank it up, it hugs your back and starts compressing you like a clamshell. Not good for people with back issues as this is closing your spinal disc and not opening them. good build quality but not as solid feeling as the Aeron
Herman Miller Aeron Remastered. So for the Aeron, I was considering maybe I should get a B as I still had a slight fear maybe the seat pan caused that numbing issue after 15 years. What I could tell is the lower lumbar support felt much more aggressive if needed or could be backed off on the B compared to the C. The C size couldn't get as aggressive but the C was still comfortable and maybe agressive support is not always the best. I would describe the C support as feeling more natural and not really digging into you. This was with the Posturefit SL. They say you should have 3 fingers spacing behind your legs and on the C i only had one. The B seemed more confining and adding pressure to the sides of my thighs and under my legs as the hump of the pan is further back. So for that reason I went with a C again as the hump of the pan is up front where my thighs are thinner and less pressure. I also feel the remastered will be even less prone to numbing cause Herman Miller removed the foam insert at the front and the seat pan pitch is now forward 2 degrees.
So in the end I went back to the Aeron C remastered and after a week my back is great which is a relief because even thought I bought it new at an amazing price with a legit authorized dealer 12 year warranty, returns aren't accepted. So even though I am breaking the 2-3 finger rule behind the legs, the larger seat pan on the C is just so much more comfortable. So if you are on the border of a B and C, make sure you try a C.