how much cash?
85mm f1.8 is nice lens
Available light or off camera flash/ studio work?
only looking at about £250 max
Which for me says you need a nifty fifty.
I have a nifty, just wondering if there was anything better, looking to do both head/shoulder and full body shots
get one second hand for about £230

May I ask why you want a 1.4 in a studio? Please enlighten me.
May I ask why you want a 1.4 in a studio? Please enlighten me.
Available light or off camera flash/ studio work?
Both

You wouldn't, but the OP said they'd be doing studio stuff as well as natural light, so it's probably better to have a fast lens that can be stopped down when in the studio, than a slow lens that works wonders in the studio but not at all when the light starts to go outside. Unless I've misread something in this thread!
Chris
May I ask why you want a 1.4 in a studio? Please enlighten me.
same reason you would use it outside - small DOF although the 85 is f1.8![]()