No, I would not call it warm (but not that cold as Sabre chip
but I do not think that Pioneer is cold as many other devices on the ESS chips).
This is PCM1795 DAC in its best implementation, this is not a warm AKM for sure ))
It is at a higher level of everything than Pioneer except the power (80 mW max vs 150 mW - both balanced).
The thing is that I'm satisfied with the Pioneer performance too as my daily on-the-go source.
The battery of Vantam Classic Master lasts for 3 - 3.5 hours (vs 4.5 - 5 hours of the standard Vantam).
When you connect Pioneer to Vantam the DAP will ask if Music App can connect to usb device - just say NO and start streaming Tidal. Make sure your volume level on the Pioneer is not at Minimum. You can control the volume of the Vantam from the Pioneer.