Except how is that achievable? Is Dave the owner of company x going to want to be paid the same as Steve who cleans his toilet? Hell no. Pay Steve 100k and Dave will pay himself 2mil.
Well for starters, the company would have to be able to afford Dave that much considering that payroll would be higher with all the Steves earning more.
Additionally., the shareholder would have to be happy with that level of compensation.
But the real key is a mix improved social awareness and government policies including taxation. This is successful in many other countries including Japan and Scandinavian countries.
Income tax can be increased a lot, it is relatively low in the UK. It is also possible to have increased employer side taxation on all salaries above a certain threshold, perhaps at 200% above median. Even better is wage ratio limits or taxation penalties, e.g. addition on any employee earning more than 8x to 10x the lowest income employee average.
In German all medium and large companies had an advisory board made up of at least 50% employees. All executive pays have to be approved from non-executive employee committees. These boards in general follow wage ratio rules unless there are clear reasons not to.
This doesn't mean that Dave gets paid the same as Steve, but is more likely to earn within a certain ratio.
The wage ratio in the UK is horrific but the rich have managed to pass the blame on to the poor while they exploit the majority of the population.