I used to not care about lumbar until recently when I'm noticing some issue with my lower back. Life has a way of teaching us a lesson and one should pay attention to even the slightest signs.
I think they are different model because this one that I saw has an adjustable lumbar support. I saw the other chairs that doesn't that feature and they are S$100 cheaper. The comfort level is different with this one and so I wouldn't mind spending more.
Thanks for sharing about you Ikea chair. It's a good help for me to decide.