The Mauser M18 & Sauer 100 were both designed to be Tikka killers.
What features make it more desirable than a Tikka? Was about to recommend a Tikka to a buddy.
Some of the features have been mentioned but as compared to the Tikka T3/T3x:
5-round, flush fitting mag
3-position safety
scope mounts are on a Rem 700 pattern
Stock is more substantial
These are some of the features that come to mind.