I've just picked up the quickstart for Call of Cthulhu 7th edition, which I thought was great. Given that it seems to cover off most of the essential game crunch (conflict resolution, and character generation primarily), I'm wondering if I actually need to buy the full version.
I have a bunch of 5th ed books including the core book, so I'm covered for lore and adventures, and conversion doesn't seem difficult. Given that my coffers are running a little light and the new edition is kind of pricey even as a pdf, can I get away without purchasing it? Are there any essential rules that I can't get by combining the quickstart with previous editions?