No I don't have callouses on my pads, to answer your question. I'm a computer tec. for a living so while I really don't like to admit it, other than the tips of my fingers I have soft office worker hands now.
Thats why I brought up the boxer clamps. Opening and closing them slowly will build indurance and strength. Not trying to say you have week hands, rather it takes indurance to hold bar chords through a long song and the clamps can help build it, plus they do build strength.