The Abbey Church is in the core Romanesque (from the construction period of the monastery, a predecessor building from the 11th century has been proven). The reconstruction of the Romanesque complex showed a kink in the axis.

The early Gothic Presbytery, raised above the Crypt, was built between 1401 and 1430. In the 17th century and - according to a plan by Johann Lucas von Hildebrandt for the redesign of the façade from the first third of the 18th century - the church was largely baroqueized. The stucco work (1665 to 1681) was created by masters from northern Italy.

The high altar painting of the Assumption into Heaven (1694) is by Andreas Wolff; the high altar (with statues of St. Peter, St. Paul, St. Gregory, St. Altmann, St. Catherine, St. Barbara and the Virgin Mary), which forms an ensemble with the pulpit and parts of the organ prospect, is by Hermann Schmidt (1639). The inlaid choir stalls were made by Franz Staudinger in 1766; the two imperial chairs (now used as ambo) were probably made somewhat earlier in the same workshop.

Two altarpieces by Martin Johann Schmidt can be seen in the eight side chapels of the nave (Altmann Altar and Benedictus Altar in the southern row of chapels).

In the summer sacristy, attached to the south of the presbytery, you will find the former high altar of the Abbey Church and, in the treasury there, paraments and liturgical objects, including special items such as a Gothic host dove, an Art Nouveau chalice and Baroque leather chasubles.

The original entrance to the Abbey Church was through a south portal (with an inscription and niche Madonna from 1668), which was walled up in the 18th century and reopened in the course of the construction of the barrier-free access in 2010.

The double-tower façade was only built between 1750 and 1755; the spires were not built, so the provisional blunt church tower tent roofs remained. The lower windows of the towers and the clocks of the south tower are also only painted on.