Or Not???

Oslo 'priciest city in the world'
BBC World

After 14 years as the world's most expensive city, Tokyo has been knocked off its top spot - by Oslo.

10 MOST EXPENSIVE CITIES
1st - Oslo, Norway
2nd - Tokyo, Japan
3rd - Reykjavik, Iceland
= 4th - Osaka, Japan
= 4th Paris, France
6th - Copenhagen, Denmark
7th - London, UK
8th - Zurich, Switzerland
9th - Geneva, Switzerland
10th - Helsinki, Finland

I just read on the Korean Times that Seoul was 8th on the list... what happened? Where did they get their stats???
And... I guess it all depends on who is doing the survey, and what they include.

Oslo joins the group of most expensive cities in the world
By Tann vom Hove, Editor

1 February 2006: Deciding on which is the world’s most expensive city is a little bit like choosing between the merits of various world heavy weight boxing champions. Until recently the choice has been between Tokyo and London. But in its latest ‘Worldwide cost of living survey’ the Economist Intelligence Unit (EIU) says Oslo had overtaken Tokyo as the world’s costliest city. And in June 2006, Mercer Consulting says Moscow was the most expensive city in the world, with Oslo being ranked 10th. Meanwhile, Swiss Bank UBS puts London in first place, followed by Oslo, New York and Tokyo.

London is the most expensive city in the world while Swiss cities are home to highest earners
A report by UBS

London is the most expensive city in the world due to the UK capital’s high cost of renting accommodation. If rents are excluded, Oslo, Copenhagen, Tokyo and Zurich are among the most costly cities in the world. In terms of living costs, Oslo remains the most expensive of the 71 cities surveyed, now followed by Copenhagen, Tokyo, Zurich and London.
...
Rank/City
1 London
2 Oslo
3 New York
4 Tokyo
5 Copenhagen
6 Hong Kong
7 Zurich
8 Paris
9 Chicago
10 Geneva
...
27 Seoul