  The recent CLAS 2005, SAPHIR 2003, LEPS, and the old, pre-1972, data on K^+
Lambda photoproduction are compared with theoretical calculations in the energy
region of E_gamma^lab < 2.6 GeV in order to learn about their mutual
consistency. The isobaric models Kaon-Maid and Saclay-Lyon, along with new fits
to the CLAS data are utilized in this analysis. The SAPHIR 2003 data are shown
to be coherently shifted down with respect to the CLAS, LEPS, and pre-1972
data, especially at forward kaon angles. The CLAS, LEPS, and pre-1972 data in
the forward hemisphere can be described satisfactorily by using the isobaric
model without hadronic form factors. The inclusion of the hadronic form factors
yields a strong suppression of the cross sections at small kaon angles and c.m.
energies larger than 1.9 GeV, which is not observed in the existing
experimental data. We demonstrate that the discrepancy between the CLAS and
SAPHIR data has a significant impact on the predicted values of the mass and
width of the ``missing-resonance'' D_{13}(1895) in the Kaon-Maid model.
