.
There is something about the key of Db on piano. Look at your RH fingers, thumb to pinky: short, long, long,long, short. Put your thumb on f. See how nicely the long fingers fit on the black keys?
It feels right and natural.

Not only that, but the key of Db has a particular musical quality that, for me, is quite distinct. Something like melancholy or solemn, or something. Words fail, of course. I just like the way it makes me feel.

Mac and the others are right about playing in all keys, of course, and I continue to strive for that degree of musicianship.
.
.

Flatfoot sez: Call me when 'Talent-in-a-Box' is ready to ship! -- [8{>

Got some tunes on You Tube:
http://www.youtube.com/user/flatfoot50
.
My BiaB lesson site:
http://jdwolfe0.wixsite.com/learnbiab