For those who came in late, the Intel Core i3-8121U is a dual-core CPU that was the first 10nm Cannon Lake processor to appear in retail products. According to Tech Power Up, Tech Insights shoved the chip under an electron microscope.
The biggest single achievement was that Intel's 10nm density is 2.7X improved over the 14nm node. This allows Intel to shove more than 100 million transistors in one square millimetre. You can also see some significant size savings in transistor pitches.