As the others say, clock speed isn't really comparable any more...
One thing to mindful of though is that Apple are expected to launch new Macbook Pro models in the next couple of weeks. From rumours, they're looking like the biggest update in years so I'd hold back until they're announced.
Production samples of the keyboard shell have already been spotted in the wild and plenty of supply chain partners seem to be upping their quarterly or annual forecasts which would suggest a launch is imminent.
As the others say, clock speed isn't really comparable any more...
One thing to mindful of though is that Apple are expected to launch new Macbook Pro models in the next couple of weeks. From rumours, they're looking like the biggest update in years so I'd hold back until they're announced.