Small subnotebooks can absolutely carry the same processors as larger 13-inch and 15-inch options and the Vaio SX12 is the latest example. The small 12.5-inch laptop is full of surprises considering its diminutive size.
https://www.notebookcheck.net/Intel-Core-i5-1155G7-outperforms-the-Core-i7-1165G7-12-inch-Vaio-SX12-comes-with-the-performance-of-a-15-inch-Ultrabook.611462.0.html