I too would go for F, without doubt. The issue of sitting 'together'... the seats in business class aren't that conducive to 'togetherness' in any event. It's nothing like sitting in say domestic First class where you can just turn your head and speak to each other.

And being stuck in the two seats in the middle is probably not ideal for such a long flight.

If I am travelling with someone in business we always select two window seats, immediately in front or behind the other. Window seats give a view, but they also allow you to control the blinds and light. Nothing worse than being stuck in the middle of the plane trying to sleep, or trying to watch the TV screen, but the glare from the window seats makes either of those difficult.