No I don't get what Marje says either: if you have "perfect pitch" or anything near it you should also be able to mentally transpose, and feel equally at home in any key (subject to being able to sing it, of course!)
If I put a capo on a guitar at fret 2 and play a "G" chord, I know I'm in A and any other notes go with that key. Or, put another way, I'm just as happy playing an A chord on un-capoed strings as playing in G2 (A)- my voice and my mind just move with it.