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Yes, it is pretty good. Effectively a 50% increase on your US Salary, although London is more expensive than Chicago in terms of food, clothes etc. Rent will be your biggest expense, and that varies by how far you are prepared to commute to the office.
Less than 2.5% of UK household earn that much.
This may help as it shows industry specific averages -
http://www.thisismoney.co.uk/money/n...l-average.html