All head - no heart. Cool, calculating and an extreme clarity of what one is paid for, what one is expected to do, going about one's assignment in the most efficient manner and always looking for better way of doing things, in less time, doing that extra bit, which is not exactly expected et al. It has nothing to do with organisational loyalty and personal reasons for motivation. Professionalism does not depend on external factors for motivation, such as promotions or increments. A professional always has a threat from competition and must seek to acquire a competitive edge over his competitors, real or perceived.
Professionalism is independent of relationships with people involved.
I may dislike my colleague personally but given a combined assignment, we can very well make it a success by getting the desired consequences out of it. And in the process, new relationships and vistas may emerge but that is secondary. The job in hand alone gets top priority.