Thanks to @AkiraDaarkst for answer my question in his topic.
----------------------------------------------------
I am not a native English speaker, forgive my Grammatical errors.
I use camera for some Youtube videos, and net photos. a lots of are OUTDOOR DAYLIGHT, or use LED LIGHT KIT.
So maybe I am not to think about SONY A7S2, also cuz it is too expensive.
I think Panasonic G7, G8, GH4, GH5 are good choices, but GH5 will come soon in March 23, 2017(Japan). It can take double SD cards, and unlimited video record time. COOL.
BODY
PRICE(JPY)
PRICE(USD)
G7
48000
429.264
GH4
101000
903.243
G8
102284
914.725812
GH5
233160
2085.14988
GH5 is PRE-ORDER.
all of these prices are a little bit rise in these days than before. I can't tell why. Maybe sold very well, out of stock.
I did not buy these body before cuz I know nothing of SPEEDBOOSTER and Lens.
Panasonic lens selection seems more complex.
Then is EOS 80D.
BODY
PRICE(JPY)
PRICE(USD)
EOS 80D
102501
916.666443
----------------------------------------------------
400USD, 900USD, Where are the disparity and differences?
I realized that GH5 is very expensive when it includes len, I can offer it with 3000USD, but can't offer a batter len.
So I think a cheaper body with a nice len, not bad. cuz maybe I change the body few years later, but I can keep the lens.
What do you think of it ?
Thanks for all your comments and responses.