ksbal wrote in post #17659017
Will you ever be blowing up your landscape shots for print? 12 mp won't be bad as long as you don't have to crop a bunch, but the 24mp offers more cropping ability.
I don't intend to make a poster or street advertisement so I don't need full-blown picture per say.
ksbal wrote in post #17659017
If you need tracking, then again, the A7II is a better option, but you may not need that.
Do you mean GPS tracking? I thought both doesn't have GPS tracking feature in it?
ksbal wrote in post #17659017
Totally depends on your type of shooting and processing. The original A7 and A7r would also work fine, if you buy native lenses to go with it. Could start with an A7r, give it a go, and then change depending on how that does or doesn't fit your bill, and then have it as a landscape camera.
I was hoping to pair the camera body with kit lens 28-70 f3.5-5.6; I understand that the kit lens is excellent enough lens for all-purpose. From my past experience, when it comes to purchasing lens, bigger aperture lens tend to be more expensive (overall speaking), so I was hoping that the camera body will be able to compensate the cheaper lens with smaller aperture by jacking up the ISO. Is this wrong way of thinking?
Charlie wrote in post #17658228
depends on your lenses. If you have really fast lenses, you may not need super high ISO as much as compared to slow lenses like zooms. I you shoot slower lenses, get the A7s, otherwise, shoot the A7ii, that IBIS helps a ton, you can shoot 1/80 reliably (for people), using primes that dont have stabilization. With my personal configuration of all F2 and faster primes, 1/80 gives me good amount of light, that I'm seldom using ISO's above 6400 for events, and at that ISO, the A7ii's performance is very good. if you need high shutter speeds and action indoors, the A7s wont be beat in IQ, however the A7ii has advantages with focusing, since it can do phase detect with native lenses.
Yes, I understand where you coming from Charlie; the thing is I am starting from clean slate; I have no body and I have no lens 
I just sold my Canon 7D and all the lenses so yes, it's a fresh new start.
As I mainly be taking candid photos of people indoor, you are right; I do need fast lenses but fast lenses are usually quite expensive and i was hoping that the high ISO from A7s can compensate for that.
The lens that I am thinking to get initially is: 28-70mm f3.5-5.6 ... small aperture so A7s probably be the better choice here for indoor shooting under dim lighting.
The next lens in-line is: 55mm f1.8 ... bigger aperture so A7ii can probably cope with indoor shooting under dim lighting.