The CZ-75B Stainless may be as close as we ever come to a stainless CZ-85 COMBAT but there are some significant differences.
As noted the CZ-85 (and COMBAT) have ambidextrous slide releases as well as the same ambidextrous safeties of the CZ-75B Stainless, the ambidextrous safeties of the SP-01 are internally different. The magazine release on the CZ-75B Stainless (and SP-01) are reversible, not so on the regular CZ-75/85 and COMBAT. The frame of some Stainless models is the same shape as the SA, not regular cz-75/85's. The new "limited edition" Stainless uses the regular frame shape.
Internally the CZ-85 COMBAT does not have the firing pin block, the lockwork is the same at the original CZ-75. Also the CZ-85 COMBAT is the only one to have adjustable sights.
Ideally a "new" CZ-85 COMBAT Stainless would have the SA frame shape, a reversible magazine release, and some new adjustable tritium sights.