I would not buy into a dSLR system at this point for someone who doesn't already have a significant investment in gear. Mirrorless is the future, I would recommend Sony FE or E, Fuji or Micro 4/3. I guess Samsung is probably in it for the long haul too.
With mirrorless, you can adapt any of the dSLR lenses you want, sometimes they are a lot better to use on mirrorless, such as any manual focus lenses and tilt/shift lenses.
With dSLR gear you are dealing with stuff like
- the autofocus isn't reliable for landscape photography, so you have to use MF, which isn't reliable with the OVF, so you have to MF on the back LCD
- mirror slap, unless you shoot with MLU, which means you pretty much must use a tripod, or else squint at the back of your camera while holding several pounds of gear away from your body.
- impossible to judge results of the picture by looking at the VF
- no video without the viewfinder
- much bigger and bulkier bodies
On the plus side, tracking AF for long focal lengths is better on dSLRs right now (and the Sony A77M2, which is a sort of hybrid between dSLRs and mirrorless)
In the world of mirrorless, Micro 4/3 is very nice for a very portable solution with small lenses and bodies. Samsung seems to be filling out a high quality system, although not a particularly small and compact one. And Fuji's lens lineup gets very high marks for consistent high quality and no "duds".
Sony offers the highest potential IQ of mirrorless platforms, with the largest sensor. Some of the latest FE lenses are world-class, and of course you can take any dSLR lens. You don't have the autofocus accuracy problems that plague fast normal and UWA lenses on dSLRs either, since mirrorless cameras AF on the image capturing sensor.
I personally prefer the Sony E-mount system best overall, as it offers a mix of tiny, high-featured bodies (Alpha 6000, Alpha 5100), tiny walkabout lenses (16-50), and higher-end potential A7II, A7s, A7r and successors due shortly. The Sony camera and lens ecosystem is not fully mature, but is attracting enormous interest and mindshare and some of the lenses are the best AF lenses available in their class (FE55/1.8, FE35/1.4, FE90/). For almost any manual focus glass, the Sony provides a better platform than a Canon or Nikon dSLR, since you can critically focus in the viewfinder, which is extremely difficult with today's OVFs.
And of course for video use, which is increasingly important, EVF trumps OVF, which shows nothing but black while recording video.
If you choose a Sony, I'd recommend you buy a A7II or Alpha 6000 or wait for the A7r replacement due imminently. The A7R has a bothersome shutter slap because of no EFCS.