http://onlinelibrary.wiley.com.ezpro...12293/abstract
Meta-analysis results are generally solid evidence of a thing. The authors claim that 10 of 13 studies had some methodological flaws worth considering when weighing the evidence, but they had a couple of excellent-quality designs that came out with the same findings.
I'm inclined to agree (based on the sources from the Psyc Today article) that circumcision doesn't significantly impact penile sensitivity, either between subjects, or before/after.