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Advanced Custom Fields version 5 is arguably the most powerful version of ACF yet. One of the biggest changes is the fact that ACF no longer uses the wppostmeta table to store field info, instead ACF fields are now custom post types which get stored in the wpposts table alongside your pages, media, posts and other custom content. What this means is editing field values is a lot easier for us developers, as well as supporting relationships between fields and more.
Another welcome change is the fact all addons have been integrated into the pro version itself. Previously in version 4 and below you had to purchase separate plugins, then install and maintain them. While this wasn’t a bad thing, version 5 integrates these into the one plugin meaning you only have to update the plugin itself and not 4+ plugins plus ACF nulled core itself. This is a welcome change.