The terms SLC and Level 1.1 are used to describe the same: Complex data with phase information in slant geometry. They are just used inconsistently throughout the many SAR missions.

Full polarimetric data is provided by:

• ALOS PALSAR (L-band, PLR mode at 25-90 m resolution) http://www.eorc.jaxa.jp/ALOS/en/about/palsar.htm
• ALOS 2 (L-band, SM2 mode at 6 m resolution) http://en.alos-pasco.com/alos-2/palsar-2/
• TerraSAR-X (X-band, experimental SM Quad mode at 3 m resolution) http://sss.terrasar-x.dlr.de/docs/TX-GS-DD-3302.pdf
• Radarsat-2 (C-band, fine to wide quadpol mode at 12-30 m resolution) http://www.asc-csa.gc.ca/eng/satellites/radarsat/radarsat-tableau.asp
• SIR-C (X, C and L-band, some modes, mission was only 1994) https://lta.cr.usgs.gov/SIRC

The terms SLC and Level 1.1 are used to describe the same: Complex data with phase information in slant geometry. They are just used inconsistently throughout the many SAR missions.

Full polarimetric data is provided by:

• ALOS PALSAR (L-band, PLR mode at 25-90 m resolution) http://www.eorc.jaxa.jp/ALOS/en/about/palsar.htm
• ALOS 2 (L-band, SM2 mode at 6 m resolution) http://en.alos-pasco.com/alos-2/palsar-2/
• TerraSAR-X (X-band, experimental SM Quad mode at 3 m resolution) http://sss.terrasar-x.dlr.de/docs/TX-GS-DD-3302.pdf
• Radarsat-2 (C-band, fine to wide quadpol mode at 12-30 m resolution) http://www.asc-csa.gc.ca/eng/satellites/radarsat/radarsat-tableau.asp
• SIR-C (X, C and L-band, some modes, mission was only 1994) https://lta.cr.usgs.gov/SIRC

DLR's Airborne Sensor F-SAR operates fully polarimetric in X, C, S, L and P band.

A flyer about the sensor you can find here: http://www.dlr.de/Portaldata/32/Resources/dokumente/broschueren/F-SAR_Flyer_CD_druck.pdf

A SAR picture gallery is here: http://www.dlr.de/hr/en/desktopdefault.aspx/tabid-4698/7782_read-12248/

i think Sentinel 1A has.