It makes sense comparing Sony STRZA1100ES vs Onkyo TX-8020 because they both are able to give some premium features.
A significant difference between the receivers in the number of channels, Sony STRZA1100ES has 7.2 versus 2.0 for Onkyo TX-8020. Regarding power, then STRZA1100ES has such a W/Ohm ratio - 70/8, 90/6 when TX-8020 has a power of 90/6. The THD is 0.09% for the STRZA1100ES but 0.03% for the TX-8020. Only the STRZA1100ES supports Bi-amping feature. Each of the AV receivers can transmit an audio signal directly to the amplifier and bypasses any DSP processing.
Both models do not have WI-FI support. These devices do not support Bluetooth. Competitors do not have built-in Spotify service. Only the STRZA1100ES provides HDMI signal transmission in standby mode. The STRZA1100ES can scale the input HDMI signal, unlike the TX-8020. Dolby Vision technology found support only on the STRZA1100ES. Only the STRZA1100ES supports HDMI Audio Return Channel (ARC). The HDMI eARC is available only on the STRZA1100ES. Of the two receivers in our comparison, HDMI CEC is present in only the STRZA1100ES. The TX-8020 has a built-in phono stage for connecting a vinyl player. A voice control is not available. An ECO mode is not present in each of the AV receivers. The setup assistant will help you configure Sony STRZA1100ES.
Only the STRZA1100ES has a Dolby Atmos multichannel audio format support. A surround technology DTS:X is supported only by the STRZA1100ES.