As neutral as I can be about all this, and without bashing anyone or anything...
I would like pictures I upload to the web for other people to view to be as good a quality as they can be. However, if I were using Instagram, SnapChat, Facebook, Vscocam or whatever, I wouldn't be using it as some sort of "professional" or "end-all-be-all" photo program. I'd be using it for its intended purpose - to upload photos for others to see, period.
@stevelam ... in your initial photo comparison pic, about the only real image quality issue is "jaggies" on the diagonal lines in the pic between the boards of the deck. Quite frankly, assuming I'm a friend of yours interested in seeing a picture of you and your friend in Paris, I probably wouldn't have noticed them unless I studied the picture because I would have been enjoying the "moment" you were sharing via the picture. It's not like the picture is all blurry or distorted where you can't see what's going on ... the main focus of the picture is the woman in the image, and the backdrop of Paris - both of which look more than OK on my phone when I first viewed them there. It was not until I got on my PC and saw the larger versions of the pictures that I noticed what you were talking about with the jaggies.
I guess that's the long way of saying, the pure quality of your pictures when posted to Instagram probably should not be a huge matter of concern given the relative quality that both the android and iOS apps offer. And I can only assume that over time, the android app(s) will improve.
And, if you're concerned with sharing "ultra-high quality images" with friends, then just upload them to your dropbox in a given folder and send your friends/family a link to view them there, where there's no compression or image quality loss at all. Unless I'm mistaken, Instagram was never meant to be some "professional picture quality" sharing app ... it's just a social media app for sharing "moments" in the form of images/pictures ... and at the current moment, even with its limitations, it's doing a fine job of that.
Now, Vscocam ... i have never even heard of that until this thread, so I have NO idea what that app's intended purpose is. That may very well be some sort of professional image sharing program ... I dont know.
Hope you're not offended by those comments ... I am just being as objective about things as I can, and am offering a perspective you may wish to adopt using these free social media apps. And, in the end, iOS may be better for YOU ... if your concerns are such that pure image quality in Instagram is that important to you.