Samson is a low end product, Sennhieser is a med grade product, so yes you will see a good improvment. you may also conciter buying a countryman mic to improve the quality, it will work with your Samson transmitter and with other tramsmitters when you later upgrade, although you may need a adpater later depending on what you buy.
Also what type of recording are you doing? is it field, studio, is it news interview style? I would not use a wireless unless you have to, wired mics always sound better then a wireless.
Hope this helps
