Answering my own question, the answer is yes...
Cisco VPN Phone support Certificate Authentication. The configuration details below:
Certificate Authentication Configuration
In order to configure certificate authentication, complete these steps in CallManager and the ASA:
From the menu bar, choose Advanced Features > VPN > VPN Profile.
Confirm the Client Authentication Method field is set to Certificate.
Log in to CallManager. From the menu bar, choose Unified OS Administration > Security > Certificate Management > Find.
Export the correct certificate(s) for the selected certificate authentication method:
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