I understand the appeal of those old Fenwicks. Have and still use an old Fenwick FF80 (Fenglass variety) loaded with a 1495 medalist and 8 wt line. For the first 50 or so years of its life I ran a 7 on it, mostly for smallmouth in the upper Potomac and in northern New England. It (still) has an absolutely magic feel to it. These days it sees duty mostly as a light buggin' rod on small lakes and farm ponds.
As to the Cabelas glass rods of recent persuasion, I have wiggled those in the store and definitely notice a difference. Here's my comparison: the old Fenwicks (I have two to compare with, an admittedly small comparison set) seem to be a bit faster tapered than the new Cabelas ones, with less of a wet noodle feel. I like the Fenwicks way better.
