For professional processing of all film formats I recommend:

Pixelgrain

Rosenstraße 16-17
10178 Berlin-Mitte
Mo. – Fr. 09 – 21 Uhr
Sunday 14 – 20 Uhr
Tel. 030-30 87 87- 0

http://www.pixelgrain.com

They do all kinds of photography related things as printing, scanning etc. Stocks a good selection of films in all formats and prices are good. They're just off Alexanderplatz and a five minute walk from Fotoimpex

Also highly recommended for E6 processing; all formats:
http://www.schwarz-weiss-labor.de/

Genthiner Str.3
10785 Berlin
Tel. 030-261 60 61

For Agfa Scala processing:

http://www.phototechnik-berlin.de/

Eisenacher Straße 36
10781 Berlin
Tel. 030 - 21 344 32

Mo. - Fr. 10-19:00, Sa. 10-14:00