Oppo has officially announced that the Find N5, the world's thinnest book-style folding phone, will launch globally on February 20, and as a long-time fan of its predecessor, the OnePlus Open (which is marketed as the Oppo Find N3 in China), I’m feeling the excitement. At an official Oppo event, I went hands-on with the Find N5, and I can tell you first-hand that this is an impressive device that genuinely feels like a normal slab phone when folded. I was amazed at just how thin the Find N5 felt in-hand, and can already foresee the device joining our list…