  Wide-angle Compton scattering (WACS) is discussed within the handbag approach
in which the amplitudes are given by products of hard subprocess amplitudes and
form factors, specific to Compton scattering, which represent 1/x-moments of
generalized parton distributions (GPDs). The quality of our present knowledge
of these form factors and of the underlying GPDs is examined. As will be
discussed in some detail the form factor R_A and the underlying GPD H-tilde are
poorly known. It is argued that future data on the spin correlations A_{LL}
and/or K_{LL} will allow for an extraction of R_A which can be used to
constrain the large -t behavior of H-tilde.
