Violating the WotC design structures and expanding the comparison, however, the Assassin at Level 3 gets advantage and hence Sneak Attack on anybody who hasn't taken a turn yet, and auto-critd when having advantage (and a couple Proficiency additions), which is nice but I'd wager works out being if equal mathematical value in GO over the long term.
The A cane Trickster gets some Cantrips and a few neat tricks with Mage Hand, which are admittedly delightful and useful, but comparable.
The Swashbuckler gets some movement and Initiative tricks, and a new way to get Sneak Attack, which is awesome, but still comparable.
Inquisitive gets some Skill till boni and a new way to Sneak Attack. Comparable to changing the dynamics of the drawing action.
The Mastermind gets some skills, a mimicry ability and Help as a Bonus Action. Handy, but not better.
Finally, the Scout gets some Proficiency with extra Expertise, and the ability to move as a reaction. Comparable in my book.
It's a pretty solid set of Subclasses, but if anything the Soil Knives are maybe OP in the long-term math.