I have an SR375M (Maple body, Maple neck, 3-band EQ) and LOVE the CAP pickups in it. Very growly tone - really blew me away with how good it sounded and played. Like scottfeldstein above, it made very curious as to what the higher end SR series were like these days, and I ended up buying an SR-705 5-string also. I used to own an SR series bass back in the late 80's, neck-thru, should never have parted with it.
Anyway, I'm VERY impressed with the tones of the CAP pickups. I've had daily opportunities for the past several months to A/B the CAP pickups with the Bartolini MK1's through my gear and feel comfortable saying that what strikes me as the most similar aspects of the two pickups are the voicing of the low end and the mid range voicing. Nearly identical to my ears. In that regard, they both retain the Ibanez sound. AKA, the Bartolini MK1 sound if you will. But the biggest difference is definitely in the high end.
The Bart MK1's are much more extended in the high frequency area. That may or may not work for you. I love the tone of the MK1's but through my GK MB-500 rig, the top end was a bit too extended for my needs - even with the onboard Treble knob set flat.
I actually bought & installed a set of CAP-EFX (Extended Frequency) pickups direct from Ibanez, and they are perfect for my needs! My SR-705 still sounds like my SR-705 if you know what I mean. They didn't turn my SR-705 into a completely different sounding bass, nor did I want them to. I can still get the same amount of MK1 highs from the CAPs, if I turn the treble knob up towards the end of its spectrum. Before, the MK1's were just too bright with my EQ set flat, and I found myself having to roll off the treble if anything, I never boosted the highs at all.
The CAP pickups worked out perfect for me - they tamed the highs down a bit for me, but I can dial them in if I want and the fundamental low and mid-range voicing that I loved with the MK1's are virtually identical. The CAP pickups are a little lower in output than the MK1 pickups as well, which is fine by me because the MK1's would tend to clip the front end of my MB-500 pretty easily if I didn't pay close attention to the gain settings. The CAP's were a perfect replacement for me all the way around. I am still hanging onto the MK1's if I ever want to put things back to stock, but as long as I own the instrument, the CAP's will be staying in it.
That's my take on CAP pickups vs. MK1's - IMO, IME, YMMV, etc. etc.
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