(No association with Altberg other than as a customer.)
Something that doesn't seem to have been mentioned about Altberg is that they can adjust the boots to fit your feet if you go to the factory. I got a pair of Field & Fell Original a few years back that were a bit narrow around the toes as a standard boot. After taking some measurements of my feet, the guy disappeared with them and came back with the toe area widened. The fit was much better. The boots are black, and they had a sheen of white condensation on the adjusted area, so I assume they have some sort of pusher gizmo that goes inside, and which uses hot water or steam to soften the leather to get it to change shape. He also did my old Scarpas at the same time (for free, since I was spending a wad anyway), and made a huge difference to them (I slip them on for quick photography bimbles now, when I would just avoid them in the past).
If you have normal feet, I dare say that the various 'normal' boots out there can be fine, but I've always had trouble finding boots and shoes that fit well. My feet are a bit wide at the toes, and maybe a bit narrow at the heels, and the right foot is wider than the left. Different makers use different lasts, and one could conceivably try all sorts of boots in the hope of finding a make where the last matches your feet.
The one mistake I made when I went to Altberg was to want the boots right away (I was going to a big airsoft weekend game nearby and wanted my shiny new kit). Ideally, I should have waited for them to make a pair of boots in a slightly bigger width fitting, but I was impatient. As it is, the boots I have are sometimes still a little tight around the right toes (but only marginally so, and only after my feet have swollen up from walking a distance). They also have the Sympatex lining, which I'm not so keen on (first pair of membrane boots) - the insides get a bit sweaty. I find them excellent for landscape photography where I'm not walking too much, and where the terrain is rough. They're also better for driving the Land Rover than the Scarpas, and more comfy for walking on hard paving slabs and the like (still a bit stiff, but less so than the Scarpas). Build quality is excellent - no issues at all.
Having tried a pair of Altbergs, and experienced the difference their fitting can make, I think I'd be quite happy to order another pair for longer walks, but would be more patient while they go away and make a wider fitting, and also get them made with no membrane, maybe leather lined (discussed this during my visit, and the guy said they can do this). I don't know how much extra that would cost, but I'm pretty sure it would be less than going through a few pairs of £150-200 boots from other makers while trying to assess whether their particular lasts work with my feet.
A final comment: When people say that X, Y or Z's boots are really comfy, all they're really saying is that they're comfy for the particular feet that are going inside them. This tells you nothing about whether they're comfy for your feet. So far as I'm aware, Altberg are the only bootmaker that offers this custom sizing service and, with a history of walking boots that don't quite fit right, I would have to say that they're the only choice for me.