Microwave radiation is obviously a GREAT deal higher in frequency than HF, and works 'better' at cooking your flesh!
However, you would have to work extremely hard for a microwave oven to burn you, there are three interlock switches on the door to prevent it operating with the door open, and even a one inch hole through the glass door and metal grill only leaks a very small amount, well under UK limits, and even under USA limts (the USA limit is 1/10th the UK limit 0.5mW as opposed to 5mW). As ovens are obviously made to one standard, this means that the UK limit is very rarely approached!.