Are you sure? I did a cross-comparison recently and found LuaJIT still to be factor 1.3 to 1.5 faster than V8 in geometric mean (I used the Node.js implementation on the CLBG).
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V8 8.0 is consistently faster than LuaJIT 2.1 on my machine even on heavily numeric benchmarks like Fannkuch or n-body.
Anything more realistic involving actual object access, not even allocation, and V8 wins by large margins.
time luajit-2.1.0-beta3 nbody.lua 50000000 real 0m8.437s
time node nbody.js 50000000 real 0m5.065s
I assume you would get another result running all CLBG algorithms and comparing the geometric means. I also run benchmarks including (hashed) table/field access and was virtually as fast as the same program when compiled natively, see https://github.com/rochus-keller/Oberon/blob/master/testcase.... Of course there are parts where LuaJIT 2.0 is slower than native, but there are also some opposite cases.