I teach at an academic FE college (mostly teaches 'A' levels) and so most schools are 11- 16. So the standard is that most students will leave school at 16, and go on to either the 'A' level college, or the vocational college if that's what they want to do.
Whilst, the downside of this system is that the 11 - 16 schools suffer (for reasons previously stated), I do think that it is better for 'A' levels.
For example, where I am there are lots of choices for 'A' levels - students don't just choose history 'A' level, they choose what period they want to study (ancient, tudors or modern). This has real benefits because if you're interested in something, then you do find it easier to learn! The second benefit is that teachers are more specialist. For example, most of the lecturers in my department have a higher degree (they outnumber the number of teachers with just the one degree). A lot of lecturers have got Phds too. Also, we're actively encouraged to be 'A' level examiners... again most departments have got at least one examiner in them and because we don't teach when we're marking, it is easier for us to be examiners, and so we make up the majority of teachers (not something I ever experienced when I taught in schools). Finally, I do think students are better prepared for uni. The point of college is that it is supposed to be a halfway house to uni, so it is a lot more geered up. Some of the schools I worked in used to get great 'A' level results, but they still supervised the students in their free periods (and enforced silent study on them) and they were in no way prepared for uni.
The resulst may not always be as great - but there are complex reasons for that - the fact that students at colleges tend not to do general studies which artificially boosts up school grades, and perceptions of colleges, which mean that some more academic students avoid college etc. But on the whole, I think the 11 - 16 schools, plus College has got a lot going for it, and having taught under both systems, I do think the college system is better.
Just my random mutterings though!