The 2017 edition takes time to adapt when you're so comfortable working with the 2005 standard. It's a complete reworking in the likes of 9001 from what I've read. 18 deficiencies came out of our 2-day renewal assessment to 2017. Even with 2 months to prepare it caught us by surprise. I was able to answer and fix all 18 in the 60 days but not without a lot of help from resources like Eurolab, this forum, other Cabs like ANAB, and some from ours, A2LA.
I'm currently working with an ISO/IEC 17025 accredited lab and I don't see much difference which would make that significant of a change. Yes, the section 4 and 6 requirements are different, but the rest is basic blocking and tackling (doesn't need changing much) from what was required under 2008... I'd be interested in what the 18 deficiencies were. Was it auditor bias?
I would like to say half were probably assessor bias or interpretation but most were not technical in nature, rather, writing procedures that didn't exist before for many clauses related to risk this and risk that.