The super high income (radiology) jobs people are alluding to here (500k-1m) are structured as partnerships that don’t offer employer contributions (depending if you own your own facilities you can potentially exit for a lump-sum at retirement, if you are just part of a hospital based group you don’t have any assets other than the contract so it’s like a 1-200k exit similar to the buy-in).
My surgeon friends in that income bracket are also all fee-for-service/eat what you kill rats that also don’t get employer retirement contributions/benefits or equity. A lot of us don’t even get paid sick days.
The jobs that offer you defined-benefit or employer contributions for retirement are academia or HMOs which is like 250-350k in radiology.
In Canada we’re technically corporations (for tax deferral) and consequently don’t even have RRSP (401k/IRA equivalent) contribution room (unless you pay yourself in salary). But there’s no employer matching/contribution in either case.