The Blackbird original and Blackbird Sabre V.2 I find to be more efficient than the Karve plate E. However I wouldn't describe either as being inefficient. I also find the Blackbird in particular to shave 'closer' or deeper than the Karve. However I could easily and comfortably perform 3 passes with the Karve. The Blackbird is confined to 2 passes for me. If I sold all my razors and kept my Blackbird I wouldn't suffer. I'm not sure I could put the Karve in the same category. The Blackbird also looks better and has better balance IMO. Please note I only have the Karve in the shorter handle configuration.
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