In reply to alasdair19:
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> How long has 7a taken u? the E5 leaders i now are mostly 8a sporters....
The E5 leader I always used to climb with was more like F7b on bolts.
He always did his sport onsight though, so maybe that's not too disimilar to F8a redpoint?
To the OP, find a topo and check out the highest pitch grades. Find a conversion table and convert to French and British grades. And then there are three issues:
Getting to a standard where you can pretty solidly onsight that grade.
Being able to do that on a long route.
Being able to do that on Yosemite style granite cracks and slabs.
The first is just about getting better at climbing and the grades are not ridiculous so if you're committed enough you will be able to get there, barring disaster of some sort, but you might have to climb a lot to do so because they're not punter grades either.
The second probably requires some trips to European alpine sport routes, or slightly easier big routes in North America if you prefer. To avoid being affected by the length of the NW Face you're going to need to have done quite a few big, tough routes (maybe a dozen?)
The third just requires spending some time climbing in Yosemite (so don't go for a week) and not giving up when you get your arse massively caned on the first routes you try.
I don't see any reason why the NW Face free is unrealistic for you, or anyone else, but it is pretty hard so would require dedication of a major part of the next few years of your life. I wouldn't set that as a target for myself because I know I'm not going to commit that much of the next bit of my life to climbing, but it could be a good target because, unlike some big, famous routes, it isn't conditions dependent, and the weather is mostly good. On the other hand it's a long way to go if it turns into a project and you have to go back a few times.