Melanchthon showed Calvin an anti-Zwingli anti-Oecolampadius pamphlet written by a schismatic and Calvin remarked
What good purpose could it serve to assault the Zwinglians every third line, and to attack Zwingli himself in such an unmannerly style? And not even to spare Oecolampadius, that holy servant of God, whom I wish that he resembled, even in being half as good, in which case he would certainly stand far higher in my esteem than he does. O God of grace, what pleasant sport and pastime do we afford to the Papists, as if we had hired ourselves to do their work!”
The last line means that Calvin saw these schismatics as doing more harm to the Reformation than the Papists could ever hope.
Zwinglius Redivivus 
As someone who loves Calvin as a servant of God, allow me to highlight this part of the quoted statement aware that it is not the man thrust of this post: “…And not even to spare Oecolampadius, that holy servant of God, whom I wish that he resembled, even in being half as good…”
A true servant of God, no matter how high others hold him will always follow Paul in Phil 2:3 “…always considering others better than yourselves”.
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I think Calvin is saying he wishes Zwingli were half as good as Oecolampadius, or am I confused about which pronoun refers to which man?
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yes, you are.
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