A senior dev in London makes 60-80K, so it’s almost the same without cost of life adjustments. Outside of London, economy-wise, you are likely to find places more similar to eastern Europe than to Bavaria.
80K€ in Munich is a good salary, considering that you don’t have to pay for private healthcare (in the UK you have to), education is free (in the UK it costs a fortune, either in private school fees or in housing premia) and rents are much much lower than in London (for equivalent properties).
Taxes are higher in Germany, but not extremely so if you account for child deductions and family support. A family of 2 in London making 80K per annum, will spend ~20K to send a child to a random nursery, 5-6K£ in healthcare and 2K£ in public transport (just to name the first 3 thing that come to mind), and will be much poorer than a German family making 50K€ per annum.