From my retailers website. I have no personnal experience but improvements seem logical.
"Denon DL-103R: £299.99
The Denon have finally announced that they are bringing in the ‘R’ version of this classic cartridge into the UK. This features higher quality wiring, a lighter coil assembly and a slightly lower output and is considered to be the finest current production version of this classic model. The main sonic improvement over the standard version is a more refined and extended top end (with less grain) whilst still retaining the dynamic and involving sound of the DL-103. Detail retrieval also increases as does the solidity of instruments, especially in the lower mid when voices and instruments sound almost as substantial as the real thing."
