I only just started looking into cameras late last year before we went on our trip. I thought about the RX camera, among many others. I really think they have helped push pricing down and bring tech up for amateurs.
I looked at all the reviews I could find and compared the photos from various cameras. In the end, at a certain level I found I was 'more than happy enough' and we ended up with the following priority list and got the Nikon D5100 with a Nikon 28-200 lens (which with the D5100 ends up being 35-300mm lens):
- quality RAW format photos
- lots and lots of automatic pre-settings for any scenario (for dummies like me who will never bother to learn)
- high quality telephoto lens for safari/etc
- decent price but willing to spend more than all-in-one if we thought it was worth it
Camera tech has really pushed forward since I last looked 10 years ago...and now I am told 24MP is even greater than some lens resolution? The D5100 (being replaced last year by D5200 and now D5300) came way down just before Christmas and for less than the price of the RX and far far less than A7, we ended up with a camera that, so far, has very very pleasantly surprised us for photos 'we care about' (where we might blow up a waterfall or ancient ruins in b&w to 3 feet)...where we never thought we'd figure out how to make the shot (ie, in dark, backlit, in candlelight, moving animals, etc).
And for everything else, we just use a little point/click from Japan my wife got years ago.