*INSEAD : 708 (class of 2017), similar to Darden(14), Stern(12), Ross(11), and higher than Fuqua(12)
http://poetsandquants.com/2016/10/10/meet-inseads-mba-class-2017/
*LBS : 707(class of 2018), again similar to the schools listed above
https://www.london.edu/programmes/masters-courses/mba/faqs#.WQitOBMrKUl
**Oxford(Said) : 692(class of 2017), similar to Fuqua(12), McCombs(17) and CMU Tepper(19)
http://www.sbs.ox.ac.uk/programmes/degrees/mba/our-students/class-profile
**Cambridge(Judge) : 686(class of 2017), similar to CMU Tepper(19) and Emory Goizueta(20)
http://www.jbs.cam.ac.uk/programmes/mba/community/class-profile/
**IE : 670 (class of 2016) : not comparable to any top 30 US school
http://poetsandquants.com/2015/11/11/meet-the-ie-business-school-mba-class-of-2016/
Conclusion : INSEAD,LBS=US Top 11-15>Oxford, Cambridge=US Top 15-20>IE, IESE=US below US top 30
Therefore FT rankings over-rate ALL European schools, but much more so for IE, IESE and Spanish schools, while INSEAD, LBS can still be considered elite or at least semi-elite if we limit the 'elite' notion to top 15 US schools whose brand value has recognition wherever you go. Oxford/Cambridge are okay if you intend to work in the UK and have UK citizenship (which is rare for Koreans).
Historically, I think up until 2012 or so the GMAT for LBS/INSEAD was similar to US top 9-10 ranked schools, and the recent huge jump in GMAT scores have been focused on the very top US programs only. Also, when comparing schools, the rate of admissions is less important than the GMAT score since you can't rule out the issue of self-selection between schools. This phenomenon is also present in comparing colleges since many colleges are highly selective but are not so prestigious.