  We give combinatorial descriptions of the restrictions to T-fixed points of
the classes of structure sheaves of Schubert varieties in the T-equivariant
K-theory of Grassmannians and of maximal isotropic Grassmannians of orthogonal
and symplectic types. We also give formulas, based on these descriptions, for
the Hilbert series and Hilbert polynomials at T-fixed points of the
corresponding Schubert varieties. These descriptions and formulas are given in
terms of two equivalent combinatorial models: excited Young diagrams and
set-valued tableaux. The restriction fomulas are positive, in that for a
Schubert variety of codimension d, the formula equals (-1)^d times a sum, with
nonnegative coefficients, of monomials in the expressions (e^{-\alpha}-1), as
\alpha runs over the positive roots. In types A_n and C_n the restriction
formulas had been proved earlier by [Kreiman 05], [Kreiman 06] by a different
method. In type A_n, the formula for the Hilbert series had been proved earlier
by [Li-Yong 12]. The method of this paper, which relies on a restriction
formula of [Graham 02] and [Willems 06], is based on the method used by
[Ikeda-Naruse 09] to obtain the analogous formulas in equivariant cohomology.
The formulas we give differ from the K-theoretic restriction formulas given by
[Ikeda-Naruse 11], which use different versions of excited Young diagrams and
set-valued tableaux. We also give Hilbert series and Hilbert polynomial
formulas which are valid for Schubert varieties in any cominuscule flag
variety, in terms of the 0-Hecke algebra.
