This is going to seem like a strange 'waste of space' post as it's simply a love-fest. But after owning many compacts and mirrorless cameras I'm surprised the GR isn't more popular.
It's simply the greatest compact on earth - totally usable 3200 ISO, an amazing lens, fantastic customisation and a great user interface which is made even more amazing by the fact that almost every other camera interface out there is a frustrating mess.
The only thing I'd change would be to replace the accessory mount around the lens with another customisable wheel - but I have no interest in the lens adapters.
Anyway, it's price/performance/size just can't be beaten!
You need to understand that it is not about the camera body specs. Those are excuses.
The reason is about frame of its lens — of mind, of culture, of photography tradition.
28mm lens which GR has, means nothing particular in the history of world's photography — it is just one small chapter.
But
35mm means everything. It is the beginning and the end of every serious photography book.
Both Ricoh and Pentax have a talent to completely miss the mark when to comes to such obvious things; neither have a current 35mm equivalent lens for a system camera or a 35mm fixed lens digital camera. And, lo, neither are very popular brands, be it compacts or DSLRs.
A coincidence?