How to react to camera button being pressed on Xperia Z3

Is it possible at all to react to the Xperia Z3's hardware camera button? I've tried android.intent.action.CAMERA_BUTTON:

<activity
    android:name=".MainActivity"
    android:label="@string/app_name"
    android:screenOrientation="landscape">
    <intent-filter android:priority="1000">
        <action android:name="android.intent.action.CAMERA_BUTTON" />
        <category android:name="android.intent.category.DEFAULT" />
    </intent-filter>
</activity>

But still the built-in camera app is opened.

Looking into the Logcat, the button does indeed not fire a CAMERA_BUTTON intent but the specific one for the vendor app. Did anyone succeed with outsmarting the device?