Wide angle lense for Tokyo photography

Need help from those who take street photography. I am going to Tokyo in September and want to take plenty of street photography photos (especially night photography, people, buildings, alleyways). The widest lense I have is a 20mm 1.8. Those that have been to Tokyo or similar busy cities, do you think the 20mm is wide enough. I'd prefer not to buy a new lens but if I had to which would be better, 14mm 1.8 or 16mm 1.8?

One more question, has anyone used a 70-200 in Tokyo? Is it worth taking and carrying around?

Kind regards to all and thank for taking the time to read my post.