Like most things, the effects you feel may be there but they’re usually less pronounced than the evangelists/magazine review writers would have you believe and steel ‘feel’ is largely determined by design so many steel frames are barely any more ‘comfortable’ than aluminium ones
Very true IME. I have found the cheaper steel hardtails can have a ‘dead’ feeling ie. DN6 Inbred, 456, PA, Rock Lobster etc. although fork choice, wheelset, tyres and even bars also all have a marked effect on the ride. At that price point you get what you pay for and they all build into decent bikes.
I think you are right to go with 853 or similar as it will be worth it in the long term but bear in mind that just because it is a good steel tube, it doen’t necessarily mean that the frame angles/dimensions/characteristics will suit your riding style. The Soul seems to get nothing but praise but depending on your budget, how about a custom build or something like a DeKerf, Soulcraft ?
As Desf says – try before you buy if you can.