Photo gear shopping in Tokyo

I am off to Tokyo next month on business and I may look to supplement my lens collection (after flogging just about everything I had to pay for the 40D my bag is really empty
)
So I am hoping to learn some advice from folks who have been there please....
Is it significantly cheaper to buy in Tokyo - new and used gear - than it is to buy via HK?
Any recommendations on stores in the Tokyo area for Canon gear?
Many thanks in advance,
Gary

So I am hoping to learn some advice from folks who have been there please....
Is it significantly cheaper to buy in Tokyo - new and used gear - than it is to buy via HK?
Any recommendations on stores in the Tokyo area for Canon gear?
Many thanks in advance,
Gary