You are comparing apples and oranges. The Kavo PowerGrip is the most powerful in Kavo's lineup, while the C1 Master (although no longer available) was the least powerful of Schick's previous lineup.
Not sure where you are located but I suggest you look at the Schick Q Basic or Q Profi for a better comparison.
If on the other hand you are buying used, I would not reccomend the C1 Master for partial frameworks. It is not what it was designed for and you will be disappointed.