Now the cacophony caused by the "we're not racist" backslapping has ended, the true implications of a Khan mayoralty are being realised.
In Britain's capital over the past year, Khan presided over rises in knife crime, gun crime, theft, burglary, rape, homicide, and more. And not just by a little bit, either.
Some in the media - by which I mean basically just me - predicted Khan might be a disaster for London, but the extent to which this is true was beyond even our worst nightmares.
Parking the anecdotal evidence of Khan giving preference to genital mutilation-linked groups, and using his platform to agitate against the U.S. President, the statistics reveal a terrifying incompetence in keeping London safe - one of the mayor's core areas of responsibility.
Data from the Mayor of London's Police and Crime Office - led by former lobbyist-turned-Deputy Mayor Sophie Linden - reveals a sharp uptick in violent crime in Khan's first year.
From the years 2015/16 to 2016/17, homicides in London rose by 27.1 per cent. Youth homicide jumped 70 per cent. Serious youth violence was up 19 per cent. Robbery was up 33.4 per cent, while home burglaries rose by 18.7 per cent.
Theft went up by over 10,000 incidents in a year, up 33.9 per cent, and there were more than 4,000 additional knife crime incidents under Khan than under his predecessor, a rise of 31.3 per cent.
Rape in the capital rose by 18.3 per cent, while there were 2,551 incidents of gun crime, representing a rise of 16.3 per cent on the previous year.
The Mayor has continuously blamed central government "police cuts" for the problems faced, but statistics reveal London only lost around 1,000 police officers (3 per cent) in the past year, reducing the workforce from 31,343 to 30,379.
The report compares November to October data from the years 2015/16 and 2016/17.
The Guido Fawkes blog notes: "In the years before Khan became mayor the numbers had fallen significantly - the Tories had got the numbers down to between 10 and 15 deaths of young people per year from over 30" and asks: "Why isn't Sadiq facing more pressure on this? It should really be a much bigger story..."
Of 40 categories, crime in just six areas fell: anti-social behaviour calls (1.2 per cent), domestic abuse incidents (four per cent), domestic abuse with injury (one per cent), non-home or business burglaries (10 per cent), criminal damage (1.6 per cent) and disability-related hate crime (34 per cent).
Comment: For over a decade budgets for the police, social programs and the NHS have been slashed, unemployment, poverty and food bank use continue to skyrocket and the economy continues to stagnate, so chances are the rise in crime isn't just because of Sadiq Khan's entry into office, his predecessor was babbling Boris Johnson after all, this is just another sign of the UK crumbling under the weight of its inept and corrupt establishment.