Interesting, I only looked at the pritty graphs, eg a FTSE 100 tracker v CTY looks remarkably similar, and for the last year the tracker has outperformed it, but only by a bit and only for a year so who's counting.
But can you compare CTY to the all-share index, or skew it to FTSE 100 or 350 as I thought it was much more heavily invested in the larger stocks?
I use the All-Share Index as a universal comparator for trusts, but since 90% or more of it is the FTSE 100 there is not a lot of difference. CTY, as you say, inclines to the biggest stocks but cites the FTAS as one of three benchmarks, alongside the AIC peer group and comparable open-ended funds.
The relative performance indicator that really matters to me is the Retail Prices Index. I seek to preserve the purchasing power of my capital and income, without too much of a switchback ride.
Here is CTY's latest factsheet:
https://az768132.vo.msecnd.net/document ... 3.gzip.pdf