You are getting knee room rather than leg room. But as you've worked out, there is a big piece of space on 1A-B-C which is the crew seating area during take off and landing. There is a bit of fuselage creep on 1A but it's fine for me, 1C yes, people may congregate there but usually go a little further forward, so I wouldn't be particularly concerned. There isn't a bulkhead on 1A-C so yes you can get up from any of those 3 seats without disturbing anyone else. During take off and landing, while the crew is seated then the legroom is briefly constrained.

The emergency row seating further back does have a noticeable amount of extra space between the seats, and has the advantage of a table/storage area on the seat in front, so personally I would prefer this space. However it would be impossible to get from the window seat to the aisle without disturbing the other people in the row. If the flight is less than full you may have an empty middle seat, since they still charge extra for it.

It should be pointed out that those who pay for these seats often are larger than average in terms of build. So it's not unusual to have 3 big males in these seats.