I recently went to a concert locally which had two "headline" artists - Peter Green (as in Fleetwook Mac) and John Mayall (as in the Bluesbreakers). Peter Green's band included an organist playing a real Hammond B3/C3. He was simple but hugely effective. John Mayalls man was by contrast playing a "Roland" hammond and at times clearly felt he was paid by the note. Technically brilliant but no soul whatsover. I do not blame the instrument for this although the difference in sound was noticable.

Summary: The instrument makes the sound but the musician makes the music.