LX7 vs XZ-1 vs G15

Guys
does someone care about comparing IQ, zoom, lens, low light for these three

I like LX quality, but http://www.2cameraguys.com says Olympus XZ-1 gives very sharp images in this category.

Which of these 3 have this better features?

1) IQ in Low light

2) does LX7 has EVF (think G12/15 has one). if not, how do shoot in Bright sunny day using LCD?
3) how is zoom at 4x/7X perform
thanks