>>4397426based OM-4Ti enjoyer
I have a 28mm f/2.8, 50mm f/1.4, 135mm f/2.8, 200mm f/4 and a 300mm f/4.5
I don't particularly enjoy the 28mm f/2.8 unless I'm inside which, during winter, I'm a lot. So maybe the upgrade to f/2 would be worth it since fast speed colour film comes at a premium these days.
On the other hand I use the 50mm f/1.4 A LOT so maybe the 35mm f/2 would be the way to go?
It's literally a coin toss for me.