I am a 5D3 user who (gasp) prefers SD cards to CF as I don't shoot video or high-burst sports stills. SD cards are super useful for sharing on-camera JPGs for friends and family, and my MacBook Pro has a built-in reader. So, SD is overwhelmingly a convenience for me.
But sometimes I want to share things when I am away from my laptop. So I was wondering what options I have to (a) use wifi to share files to friend's computers who may lack a card reader, or (b) use wifi, bluetooth, etc. to swap photos to my phone so that I can broadcast to Flickr, Facebook, etc.
So what options do I have? Must I switch to capturing large-capacity still work on CF to free up my SD slot for Eye-Fi? (I don't see a CF-based Eye-Fi offering.) Must it be Eye-Fi -- is there other tech I am overlooking?
Background that may guide your advice:
1) Once transferred, all my photos are entirely in the Apple ecosystem -- iPhoto, MacBook, iPhone, iCloud, all that. Facebook and Flickr are the odd need that I am referring to.
2) I never shoot tethered, nor do I need the 6D's apparently pretty cool app LiveView thing.
3) I am not a pro. These are family / fun / sightseeing snaps. No need for DRM / watermarking / etc.
4) I wouldn't want or need to swap everything I am shooting, of course. This would be the 1-3 keepers from a day out.
But if it does turn out to be Eye-Fi, can I use CF as the large storage option and then selectively pipe the few photos I want to share to a very small capacity Eye-Fi card in the SD slot? Or must I capture the photos originally on the Eye-Fi card?