The SR has the different lever, Ti springs, bolts, fittings and a bearing in the mech instead of a bush plus a more pronounced click
Record vs Chorus the differnce in the shifters is..... The screen print on the levers..
If I remember rightly that's the only difference.
As a gruppo The brakes, chain, cassette, 'railers and cranks are lighter.
They have the same design, actual operation and functionality
For the first generation of 11-speed (i.e. through 2010), Chorus, Record and Super Record all used a bearing instead of a bushing in the mechanical. I think it is the same with the current generation (i.e. 2011 to present). The Record lever now has cut-outs in the upper portion of the brake lever. The Super Record then adds a carbon fiber inlay to the up-shift lever, which would seem purely aesthetic. If Competitive Cyclist is correct in their descriptions of the shifters the only other difference between Record and Super Record is that the "internal shift disc" changes from aluminum to titanium. So I don't think it is adding "Ti springs, bolts, fittings and bearings in the mech[anical]" as indicated. The differences between the shift levers are pretty minor, and the weight differences even more so. Maybe, if the shift disc is titanium rather than aluminum there might be a slight difference in feel and the pice might be less susceptible to wear and tear.
I have both first generation 11-speed Record and Super Record. I like the shifting of the Super Record better. It is slightly smother and the downshift on my Record sometimes gets stuck, forcing me to upshift before I can downshift. I don't think the differences are between lines (i.e. Record v. Super Record) so much as idiosyncrasies of the particular lever or batch of levers.