I have heard a friend's DL103R on his Rega P3-24 (Primare amp + ATC SCM11 speakers).
At the same time he bought that, I owned a Rega P2 with Ortofon 2M Blue (with Nait 5i + Naim nSat speakers).
So therefore I heard both set-ups in different rooms, with different music and different systems. (Even the DL103R is different to the 'original' DL103 that you are asking about.)
Not very useful i'm afraid.
Obviously I preferred what I was listening to with my
P2/2M Blue/Naim system (I would wouldn't I?) but the DL103R had it's moments.
The DL103 is a big old slice of history (designed for Japan's national radio broadcaster in 1963) and modern stylus profiles have come on a long way since. (The DL103 has a spherical stylus and tracks at 2.5 grammes.)
Personally I would go for neither nowadays and opt instead for a Shure M97XE for about £75 (Stylus replacement about half that, so cheap enough to get in a brace of spare stylii and still spend less than buying one Ortofon 2M Blue.)