It makes sense comparing Onkyo TX-RZ920 vs Sony STRZA5000ES because they both are able to give some premium features.
Considered AV receivers have the same number of channels 9.2. Regarding power, then TX-RZ920 has such a W/Ohm ratio - 135/8, 175/6 when STRZA5000ES has a power of 130/8. The THD is 0.04% for the TX-RZ920 but 0.09% for the STRZA5000ES. Both the TX-RZ920 and the STRZA5000ES support Bi-amping. Each of the AV receivers can transmit an audio signal directly to the amplifier and bypasses any DSP processing. Only the TX-RZ920 has Bluetooth support. Only the TX-RZ920 supports Spotify.
Both AV receivers support HDR10 technology (High dynamic range). Compared AV receivers retain the quality of 4K/60Hz signal when transmitting from a source to a TV or projector. HDMI signal transmission in standby mode is implemented in each of the devices. Both rivals can scale the resolution of the incoming HDMI signal. The HDR standard - Dolby Vision is supported by these receivers.
The Onkyo TX-RZ920 has 8/2 HDMI inputs/outputs versus 6/2 HDMI connectors of the Sony STRZA5000ES. The HDMI Audio Return Channel (ARC) feature supports both devices. The HDMI eARC is available only on the TX-RZ920. The Consumer Electronics Control (CEC) feature is present in most modern AV receivers and the models in our comparison are no exception. Both models support the standard HDCP 2.2. The TX-RZ920 has a built-in phono stage for connecting a vinyl player.
Each of the AV receivers from our review supports 3 Multi-room zones. An ECO mode is not present in each of the AV receivers. Both TX-RZ920 and STRZA5000ES can be configured using the Setup assistant.
Both devices have support for Dolby Atmos multichannel audio format. The surround sound technology DTS:X is supported by devices under review.